The coriolis effect coupled with the frictional coupling of wind and water leads to the moving of surface water at 90° towards the right ward direction of the wind in the Northern hemisphere and to the left ward direction of the wind in the southern hemisphere.
Ekman transport helps surface water move away from the costal area.
Equatorial Upwelling occurs when surface water move farther away from the equator and becomes replaced by the Upwelling water.
The cause of the upwelling is due to the deviation of the sea currents by the rotation of the earth. In this way, the arrows that Josefina drew represent the movement of the water.
The second cause is due to the effect that the wind has on the sea.
Therefore must draw an arrow representing the wind to correctly represent the outcrop of the surface water.
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if you completely react 6 moles of h2 gas (with n2 as excess), how many moles of nh3 can be produced?
The number of moles of NH3 can be produced are 4 moles.
What is a mole?
The mole is the amount of substance in a system that includes the same number of elementary entities as there are atoms in 0.012 kilogram of carbon 12; it is denoted by the sign "mol."
What is a limiting factor?
Limiting factors are reactants or reagents that are used by a chemical reaction before other reactants. The limiting factor is the reactant or reagent with the lowest supply in terms of its required ratio in comparison to other reactants in the system.
According to the question;
Balanced equation would be :
[tex]3H_2 + N_2[/tex] ⇒ [tex]2NH_3[/tex]
Here, [tex]H_2[/tex] is a limiting factor
No. of moles of ammonia formed when 3 moles of [tex]H_2[/tex] react with excess of [tex]N_2[/tex] =2
applying unitary method:
No. of moles of ammonia formed when 6 moles of [tex]H_2[/tex] react with excess of [tex]N_2[/tex]= [tex]\frac{2}{3 } * 6[/tex] = 4moles.
The number of moles of NH3 can be produced are 4 moles.
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this is the chemical formula for methyl tert-butyl ether (the clean-fuel gasoline additive mtbe):a chemical engineer has determined by measurements that there are moles of carbon in a sample of methyl tert-butyl ether. how many moles of oxygen are in the sample?be sure your answer has the correct number of significant digits.
According to Dalton's Atomic Theory, the individual elements making up the compound has a fixed ratio. This law is known as the Law of Definite Proportions. Obeying this law, the number of hydrogen to oxygen should be a constant, so we can use ratio and proportion.
The ratio can be determined from the molecular formula of methyl tert-butyl ether: C5H12O. This is the correct molecular formula of the compound. To check, try searching it in the internet. From the molecular formula, we can see that there are 5 carbons in every 12 hydrogens and in every 1 oxygen. So, the hydrogen to oxygen ratio is 12/1. Applying ratio and proprotion,
12/1 = 0.0723 moles of hydrogen/x, where x is the amount of moles oxygen. Solving for x,
x = 0.006025 moles of oxygen
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In the Introductory Activity, the developing solvents were 2% sodium chloride aqueous solution and 2% isopropyl alcohol aqueous solution. Draw separate molecular diagrams of how sodium chloride and isopropyl alcohol would interact in water. Identify the types of intermolecular attrac- tions within each diagram.
the developing solvents were 2% sodium chloride aqueous solution and 2% isopropyl alcohol aqueous solution
What occurs if you combine salt and rubbing alcohol?Isopropyl alcohol can be "salted out," which uses salt to remove water from the substance and thereby boosts its potency. When salt is added to water, it dissolves, but is insoluble in isopropyl alcohol, which causes the water to become heavier and sink to the bottom while the alcohol floats to the top.
Salt and alcohol can they be dissolved?Salt and alcohol do not interact, despite the fact that water and alcohol do. The solution becomes salty when salt is added, but the salt dissolves in the water but not the alcohol.
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1. How many moles are present in 9.25x10^34 molecules of H2O?
2. How many moles are present in 4.51x10^15 atoms of Aluminum (AI)?
3.How many moles are present in 3.78x10^20 atoms of Lithium (Li)?
What is Stoichiometry?
Stoichiometry is the relationship between two substances through use of ratios.
To answer these questions, you must use the ratio:
1 mol of a substance
6.022 × 10²³ molecules
Let's try the first question:
9.25 × 10³⁴ molecules H₂O × 1 mol H₂O
6.022 × 10²³ molecules
The molecules will cancel out, leaving you with
9.25 × 10³⁴ mol
6.022 × 10²³ mol
Use your calculator to solve: 1.536 × 10¹¹ mol H₂O
Now, follow this same format to solve the rest of the questions:
2) 4.51 × 10¹⁵ molecules Al × 1 mol Al
6.022 × 10²³ molecules
= 4.51 × 10¹⁵ mol Al
6.022 × 10²³ mol Al
= 7.489 × 10⁻⁹ mol Al
3) 3.78 × 10²⁰ molecules Li × 1 mol Li
6.022 × 10²³ molecules
0.0006276 mol Li
_________________________________________________________
1.536 × 10¹¹ mol H₂O7.489 × 10⁻⁹ mol Al0.0006276 mol LiPartial bonding, for example, as part of a resonance hybrid, often results in structures with _____.
Partial bonding, for example, as part of a resonance hybrid, often results in structures with fractional bond orders.
What is resonance hybrid?
A resonance hybrid is a substance that exhibits resonance and has a structure that is stated as the average of two or more structural formulas, each of which is separated from the next by a double-headed arrow. For instance, benzene.
It is possible to explain the equal bond lengths using the resonance hybrid of this polyatomic ion, which was created from its various resonance structures.
Therefore, Partial bonding, for example, as part of a resonance hybrid, often results in structures with fractional bond orders.
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Molar Mass Values
NaN3
65.02 g/mol
Na
22.99 g/mol
N₂
28.02 g/mol
KNO,
101.11 g/mol
If 45.97 grams of sodium is produced in reaction 1, how many of grams of
nitrogen will be then be produced in reaction 2?
10 Na(s) + 2 KNO,(s) →K₂O(s) + 5 Na₂O(s) + N₂(g)
In consideration of Henry's law the molar mass of organic compound is 0.24 grams.
What is molar mass?The molar mass of a chemical compound defined as the mass of a sample of that compound devided by the amount of substance which is the number of moles in that sample,measured in moles.
Sol-One of three asks what the mass of water is in grams and two and 1/2 liters of paper of Equis, 12.5% sodium chloride, fifty five°C. This problem tells us that pure H2O is one hundred eighteen tour at fifty five*° C.So the first thing that we have to do here is figure out wth e um, the mole fraction of thermal fractions, I suppose, of both sodium chloride and water.
We know those 2.5 liters. We're looking for this number of moles here. Ideal gas constant 0.8 to 6 leader atmospheres over mole Calvin. And then we have to convert, um, Celsius, the 55 degrees C to Calvin. So we always rmember that simply 55 degrees Celsius plus two year and 73 which gets US 328 Calvin. So solving all of that for the number of moles, then that gives us 0.133 off water and 2.5 liters of vapor. So last step, then, is to just convert that to Graham's, since the problem asks for a mass and not by the number moles. So you can plug that, , basically into, uh, the molecular by it it and it does weight of water, just 18.2 grand's for mold. And that gives us keeping significant figures in mind. 0.24 grams.
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what is the molarity of a solution made by dissolving 45.6 g glucose, c6h12o6, in enough water to make 350.0 ml of solution?
The molarity of a solution made by dissolving 45.6 g glucose, C₆H₁₂O₆, in enough water to make 350.0 ml of solution is 0.722 M.
given that :
volume = 350 mL = 0.350 L
mass of glucose = 45.6 g
molar mass of glucose = 180.15 g/mol
the number of moles of glucose = mass / molar mass
= 45.6 / 180.15
= 0.253 mol
the molarity expression is given as follows :
Molarity = moles / volumes in L
= 0.253 / 0.350
= 0.722 M
Thus, the molarity of the solution to make 350.0 mL of solution is 0.722 M.
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subatomic particles are removed from glucose and end up creating water at the end of the electron transport chain?
The subatomic particles are removed from glucose and end up creating water at the end of the electron transport chain are two protons.
What is electron transport chain?
Electrons are transferred from one molecule to another in the electron transport chain and the energy released during these electron transfers is utilized to create an electrochemical gradient.
During the oxidative phosphorylation process, glucose molecules are stripped of their protons when two oxygen molecules are reduced to water using the electrons that have traveled through the electron transport chain. Once at the mitochondrial membrane, the protons are utilized to establish a proton gradient. By means of chemiosmosis, this gradient is utilized to propel the manufacturing of ATP.
Therefore the subatomic particles are removed from glucose and end up creating water at the end of the electron transport chain are two protons.
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K-42 has a half-life of 12.0 hours. At present, a given ore sample contains 34.2 mg of K-42. How much did it contain yesterday at the same time?
The amount of sample of K-42 yesterday at the same time is equal to 136.8 mg.
What is the half-life of radioactive material?The half-life of the radioactive material can be described as the time required to decrease its original amount to half after decay. The half-life of a radioactive element does not depend on the initial amount of the substance.
Consider that N₀ is the initial amount of the K-42 sample
Consider that 'n' is the number of half-lives of K-42.
The time for which K-42 decay, t = 24 hrs
Half-life of substance (t½) = 12 hrs
t = n ×t½
24 = n × 12
n = 2
Assume that N₀ is the amount of the K-42 before decay for 24 hours.
N ×2² = N₀
34.2 × 4 = N₀
N₀ = 136.8 mg
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Nuclear decay occurs according to first-order kinetics. A nuclide decays in 3. 40 days from 45. 0 g to 12. 1 g. What is the rate constant for the nuclide?.
The equilibrium law for the nuclide is 0.388 days per one, according to the announcement.
By nuclide, what do you mean?
The amount of protons, protons, and the activity state of nucleus determine the species of atom known as a nuclide, also known as a nuclear species. Thus, a nuclide is identified by its number of protons and mass number (A) (Z).
Does a nuclide resemble an atom?A nuclide is similar to but distinct from an atom or a nucleus. It has several nucleons, which define it. Nuclide, to put it simply, is a type of atom or nucleus. We characterize it using the elements that make up its nucleus, as well as the quantity of protons, neutron, and energy.
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the concentration of sodium chloride in blood serum is approximately 0.14 m. what volume (in liters) of blood serum contains 2.0 g of nacl?
The molarity of the solution and the number of moles of the solute can be used to calculate the volume of a solution. Blood serum at a concentration of 0.14 M and 2g of NaCl is 0.24 L in volume.
The term "molarity" of a material refers to its concentration. It is the proportion of the solute's moles to the liters of solution. Temperature affects a substance's molarity.
The number of moles of solute and the volume of the solution both affects the molarity of the solution. The blood serum has a molarity of 0.14 and 20g of sodium chloride.
NaCl has a molar mass of 58.5 g/mol. The following formula is used to determine how many moles of NaCl are present in the 2 g sample:
2 g = 58.5 moles in terms of moles.
= 0.034 moles.
Now, the blood serum volume is determined using the formula below:
Volume is equal to moles times molarity.
= 0.14 mol/L and 0.034 moles
= 0.24 liter.
As a result, 0.24 L of 0.14 M blood serum contains 2 g of NaCl.
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In aerobic respiration, during electron transport in the chain nadh is oxidized at _____, while fadh2 is oxidized at _____.
In aerobic respiration, nadh is oxidized at complex I during electron transport in the chain, while fadh2 is oxidized at complex II.
What is electron?GitHub created and maintains the open-source, free software framework known as Electron. The framework is made to enable the development of desktop web apps with a backend running on the Node.js runtime environment and being rendered using a variant of the Chromium browser engine. Unbound or bound to an atom, an electron seems to be a negative charge subatomic particle (not bound). The proton, neutron, and the electron that is attached to an atom are the three main types of particles.
What is electron used for and its example?JavaScript, HTML, and CSS can be used to create desktop applications using the Electron framework. With Electron, you can build cross-platform programs that run on Windows, macOS, and Linux with no prior knowledge of native development by incorporating Chromium and Node.js into its binary.
The electron, the smallest elemental part of an atom, has a negative charge. Protons and electrons both occur in equal numbers in neutral atoms. One electron and one proton are all that the hydrogen atom has. On the other hand, the uranium atom has 92 protons, which means 92 electrons.
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write the balanced net ionic equation for the reaction when strontium chloride and sodium phosphate are mixed in aqueous solution. if no reaction occurs, simply write only nr. be sure to include the proper phases for all species within the reaction.
3[tex]Sr^{2+}[/tex](aq) + 6Cl- (aq) + 6Na+ (aq) + 2PO43-(aq) → Sr3(PO4)2(s) + 6Na+ (aq) + 6Cl- (aq) is the balanced net ionic equation for the reaction when strontium chloride and sodium phosphate are mixed in aqueous solution.
What is ionic equation?When the general reaction equation of any reaction is represented by dissociating its ions is know as ionic equation.
Given:
Strontium chloride and sodium phosphate are mixed in aqueous solution to react.
To find:
The balanced net ionic equation for the given statement.
So,
first the general reaction equation for the given Statement is given below
3SrCl2 (aq) + 2Na3PO4(aq) → Sr3(PO4)2(s) + 6 NaCl(aq)
Now, we dissociate the ions to get the ionic equation for the same given reaction for the statement provided above:
So the net ionic equation for the same is :
3[tex]Sr^{2+}[/tex](aq) + 6Cl- (aq) + 6Na+ (aq) + 2PO43-(aq) → Sr3(PO4)2(s) + 6Na+ (aq) + 6Cl- (aq)
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provide a reason to explain why the less stable radical intermediate leads to the formation of the major product in this reaction.
Hybridization, electronegativity, and polarizability are three variables that affect the stability of free radicals. The unpaired electron in these radicals, which tends to donate or acquire another electron to achieve stability, is the cause of their high reactivity.
Because the bromine radical is less reactive, it is more selective for the 2° radical. Cl is less picky and less selective due to its lower stability and increased reactivity.
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Commercial methods for making fatty acid methyl esters (FAMEs): • Base-catalyzed transesterification of the oil with ________________.
Commercial methods for making fatty acid methyl esters (FAMEs). Base-catalyzed transesterification of the oil with Sodium Methoxide.
What is FAME used for?The generic chemical term for biodiesel derived from renewable sources is Fatty Acid Methyl Ester. It is used to supplement or replace mineral diesel and gas oil, which are used to power on- and off-road vehicles as well as static engines.It is formed during the biodiesel production process when vegetable oils and animal fats are transesterified. In the presence of a catalyst, usually potassium hydroxide, these high molecular weight oils and fats react with short chain alcohol to produce lower molecular weight esters (FAME).Transesterification is the process of separating the three alkoxy groups from the triglyceride's glyceryl backbone. As a byproduct of the reaction with the alcohol, three lower molecular weight esters are formed. The catalyst in the reaction is potassium hydroxide.To learn more about Fatty Acid refer :
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Calculate the standard reaction entropy for the decomposition of 1 mol calcite to carbon dioxide gas and solid calcium oxide at 25°c.
For the breakdown of 1 mol of calcite to carbon dioxide plus white precipitate oxide at 25°c, the standard reaction entropy is 160.6 J/mol*K.
How do you define reaction in chemistry?In a chemical reaction, one or more materials known as reactants—are changed into one or more additional substances as products. Chemical elements or chemical compounds make up substances.
What kind of response?Synthesis, decomposition, only one, double-replacement, and combustion are the five fundamental varieties of chemical reactions. You can classify a reaction into one of these groups by looking at the reactants and products. Several categories will apply to some reactions.
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The complete question is-
Calculate the standard reaction entropy for the decomposition of 1 mol calcite to carbon dioxide gas and solid calcium oxide at 25°C.
CaCO₃ (s) → CO₂ (g) + CaO (s)
(a). -160.6 J/mol*K
(b). 160.6 J/mol*K
(c). 346.4 J/mol*K
(d). -266.9 J/mol*K
are the physical and chemical properties of a compound necessarily similar to those of the elements of which it is composed?
Compounds have physical and chemical properties that are different from the properties elements of which it is composed.
A substance's physical property is a quality that can be seen or quantified without affecting the substance's identity. Color, density, hardness, and melting and boiling points are examples of physical qualities.
The capacity of a substance to go through a particular chemical transition is described by its chemical property. Rust is a different kind of matter than the iron, oxygen, and water present before the rust formed, hence its production is a chemical change. Chemical attributes include, for instance, flammability, toxicity, acidity, numerous types of reactivity, and heat of combustion.
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Calculate the work associated with the compression sof a gas from 121. 0 l to 80. 0 l at a constant pressure of 16. 7 atm.
The amount of energy required to compress a gas from 121 litres to 80 litres at a constant pressure of 16.7 atm is 6.94*10^4J. When the need for water increases in a system with constant pressure
As the demand for water falls, the pump speed will also decline. The pump only runs as much as required to fulfil demand in order to maintain pressure as efficiently as feasible. Using the following expression, we can determine the work (W) connected to gas compression at constant pressure:
W = -P.V, where P is the outside pressure.
V represents the volume change.
In light of the fact that 1 atm.L = 101.325 J, the work of compression is given by W = -P*(v2 - v1) = -16.7atm*(80.0 - 121.0)*(101.325/1) = 6.94*10^4J.
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A solution of potassium hydroxide (koh) is titrated against a solution of hydrochloric acid. How many moles of potassium hydroxide would react with 1 mole of hydrochloric acid?.
1 mole of potassium hydroxide would react with 1 mole of hydrochloric acid.
The balanced equation for the reaction is as follows:
[tex]KOH + HCl[/tex]→ [tex]KCl + H_{2} O[/tex]
Titration is defined as "the process of determining the quantity of a substance A by adding measured increments of substance B, the titrant, with which it reacts until exact chemical equivalence (the equivalence point) is achieved."
Titration is a common quantitative chemical analysis laboratory method for determining the concentration of an identified analyte. The titrant or titrator is a reagent that is prepared as a standard solution of known concentration and volume.
The titration's goal is to find the equivalence point, or the point at which chemically equivalent amounts of the reactants have been mixed. The amount of reactants mixed at the equivalence point is determined by the stoichiometry of the reaction.
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Derive an expression for the total mechanical energy e of the moon in terms of m, m, d and the gravitational constant g.
Fm1m2 = Gm1m2/r2 * r. A planet with a mass of M and a radius of b is orbited by a moon with a mass of m and a radius of an at a distance of d (center to center).
A mass is what?The quantity of material in a material or an object is measured by its mass. The kilogram (kg) is the fundamental SI unit of mass, while lower masses can also be expressed in grams (g). A balance is what you would use to measure mass.
How is mass determined?The kilogram (kg) is the fundamental SI unit of mass, while lower masses can also be expressed in grams (g). A balance is what you would use to measure mass. A triple beams balance can be used to quantify mass in the laboratory.
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if the volume of the system is reduced to one half of its original volume and the system is allowed to restablish equilibrium at 298k, what will be the pressure in atm, of the water vapor at the new volume
According to ideal gas law ;
PV = nRT where, P refers to the pressure of the ideal gas, V is the volume of the ideal gas, n is the total amount of ideal gas that is measured in terms of moles, R is the universal gas constant, and T is the temperature.
If Volume of system is reduced to half = V/2
then; P = 2(nRT/V), Pressure will be doubled to reestablish the equilibrium.
What is Chemical equilibrium?
Chemical equilibrium, condition in the course of a reversible chemical reaction in which no net change in the amounts of reactants and products occurs. A reversible chemical reaction is one in which the products, as soon as they are formed, react to produce the original reactants.
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with what compound will nh3 experience only ion-dipole intermolecular forces? group of answer choices ocl2 licl ch3i c3h7oh sih4
Here, we must select a chemical capable of producing an ion-dipole interaction with ammonia. Only b) NaOH will interact with the ion dipole of the NH3.
How does a dipole of ions operate?
When an ion interacts with a nonpolar molecule, a weak attraction called an ion-induced dipole force is created. In addition, a fully charged ion can polarize a nonpolar molecule by approaching it; as a result, the electrons in the molecule react and produce a dipole.
What makes it an ion-dipole?
Dipole-Ion Interaction
An electrically charged atom or molecule is known as an ion (which is to say the opposite of a neutral molecule). The term "dipole" simply refers to the presence of two poles that are negatively and positively charged. Another name for a molecule having a dipole is a
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a sample of an ideal gas has a volume of 2.37 l2.37 l at 286 k286 k and 1.06 atm.1.06 atm. calculate the pressure when the volume is 1.67 l1.67 l and the temperature is 305 k.
The pressure when the volume is 1.67 l and the temperature is 305 k 1.604 atm.
Using the ideal gas equation:-
Given;
P₁ = 1.06 atm
V₁ = 2.37 L
T₁ = 286 K
P₂ = ?
V₂ = 1.67
T₂ = 305 K
P₁V₁/T₁ =P₂V₂/T₂
P₂ = P₁V₁T₂ /T₁V₂
= 1.06 × 2.37 × 305 / 286 × 1.67
= 766.221 / 477.62
= 1.604 atm
What is Pressure?
The physical force exerted on an item is called Pressure. The force applied is vertical to the surface of items per unit area. The basic formula for pressure is Force/Area.
What is an ideal gas?
An ideal gas is an intransigent gas composed of a set of irregularly-moving point atoms that interact only through elastic conflicts.
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Make a claim about whether air is matter. Support the claim with evidence and explain your reasoning
Answer: Yes
Explanation:
Air is matter because it takes up space, has weight and is composed of particles.
how many atoms are there in one molecule of h3po4 ? how many atoms of each element are there in one molecule of h3po4 ? how many atoms are there in one molecule of ? how many atoms of each element are there in one molecule of ?
There are 8 atoms in total in one molecule of H3PO4.
There are 3 atoms of hydrogen, 1 atom of phosphorous and 4 atoms of oxygen in the one molecule of this compound, which is called hydrogen phosphate.
The charge number of an atomic nucleus is known as the atomic number or nuclear charge number (sign Z) of a chemical element. This is equivalent to the proton number (np), or the number of protons present in the nucleus of every atom of that element, for conventional nuclei. Ordinary chemical elements can be uniquely identified by their atomic number. The atomic number and the number of electrons are both equal in a typical, uncharged atom.
The total number of atoms in one molecule can be calculated as :
= 3 (H) + 1 (P) + 4(O)
=8 atoms in total
Therefore, there are 8 atoms in total in one molecule of H3PO4.
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An element from group 13 bonds with an element from group 17. Which formula correctly depicts the correct chemical formula for elements from these two groups?.
A chemical compound is created when metals and nonmetals mix in a specific ratio. AlCl3 is the compound that will be created from elements in groups 13 and 17.
A chemical compound is made up of several related molecules (or molecular entities), each of which has atoms from various chemical elements and is joined by chemical bonds. A molecule is not a compound because it is made up of only one element's atoms. A chemical reaction can convert one element into another and may involve interactions with other molecules. In the course of this process, atom-to-atom bonds may form or break.
Using the common chemical symbols with numerical subscripts, a chemical formula defines the number of atoms of each element in a compound molecule. The Chemical Abstracts Service has given a lot of chemical compounds a special CAS number that serves as an identification. More than 350,000 chemical compounds (including chemical combinations) have been registered for manufacturing and use globally.
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What is the answer of number 11?
Hope this helps!
the decomposition of has a rate constant of at a certain temperature: determine the rate of the reaction , when ?
The rate equation illustrates how altering the reactant concentrations affect the rate of the reaction. All of these are incorporated into the so-called rate constant, which is only really constant if the only variable changing is the reactant concentration.
what do you mean by the rate constant?The rate constant is the quantity that describes the connection between the molar concentration of the reactants and the rate of the chemical reaction. At 546 K, the hydrocarbon breakdown rate constant is 2.418 105 s1.
How can the rate constant k be determined for a particular temperature?The slower the reaction is at a given temperature, the greater the Ea. The steric factor is the percentage of orientations that cause a response. The Arrhenius equation has a relationship between the rate constant and the frequency factor, steric factor, and activation energy: k=AeEa/RT.
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What is the proper rate of cpr compressions for the adult cardiac arrest victim?.
The recommended pace for CPR compressions for an adult cardiac arrest sufferer is 100 to 120 per minute.
What are compressions?Compressions entail applying particular pressure towards the person's chest with your hands while pressing down quickly and firmly. Compressions constitute the most crucial CPR procedure. When administering CPR compressions, follow these steps: Place the person on a stable surface while holding her back up.
What do compressions do in CPR?CPR simulates your heart's pumping action by doing chest compressions. These compressions support your body's natural blood circulation. Heart disease and cardiac arrest are not the same thing. A heart condition occurs when the flow to the coronary artery is blocked.
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Student a says the δ h value of an exothermic energy change is always positive. Student b says δ h value of an exothermic energy change is always negative. Who is correct?.
Specific heat capacity of a substance is the amount of heat required to raise the temperature by one degree Celsius of one gram of a substance. Therefore, student a and student b are correct.
What is Enthalpy?Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances.
Mathematically,
q = n ×ΔH
where
q = amount of heat
n = no of moles
ΔH = enthalpy
n = w / M.M
Both students are correct as energy can be positive as well as negative. Any reaction in which energy is added, energy value comes out to be positive and reaction is called endothermic reaction. Any reaction in which energy is released, energy value comes out to be negative and reaction is called exothermic reaction.
Therefore, student a and student b are correct.
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