Answer:
2.83 × 10²² molecules.
Explanation:
Using the formula below to calculate the number of moles of Naphthalene:
mole = mass/molar mass
Where;
mass = 6.00g
Molar mass = 128.18 g/mol
mole = 6/128.18
mole = 0.047mol
To calculate the number of molecules of naphthalene in the mothballs, we multiply the number of moles (n) by Avagadro's number i.e.
number of molecule = n × 6.02 × 10^23
number of molecules = 0.047 × 6.02 × 10^23
= 0.283 × 10²³
= 2.83 × 10²² molecules.
when rolling a number cube 500 times, how many times you expect to get a 3?
Answer:
[tex]\frac{250}{3}[/tex]
Explanation:
you can expect to get a 3 (theoretically) 1 time every 6 times you roll. A 1/6 chance.
Here's the equation:
[tex]\frac{1}{6} =\frac{x}{500}[/tex]
cross multiply (i think that's what it is called)
500=6x
divide by 6 on both sides:
x=[tex]\frac{250}{3}[/tex] or approx 83 times.
Hope this helps! Lmk if u have more questions <3
PLEASE HELP I HAVE 19 MINUTES LEFT I WILL MARK BRAINLIEST
How much more acidic is a pH of 4 as compared to a pH of 6.5?
Answer:
316.227766
Explanation:
Calculate mL (4 sf) of 0.7500 M sodium hydroxide required to neutralize 35.00 mL of 0.7500 M phosphoric acid. Please input number as whole number not scientific notation
Answer:
105mL of 0.7500M of NaOH are required
Explanation:
Phosphoric acid, H₃PO₄, reacts with sodium hydroxide, NaOH, as follows:
H₃PO₄ + 3 NaOH → Na₃PO₄ + 3H₂O
Where 1 mole of phosphoric acid reacts with 3 moles of NaOH
To solve this question we must find, as first, the moles of H3PO4 that react. Using the chemical equation we can find the moles of NaOH required to neutralize this acid. And, with its concentration, we can find the volume oof NaOH required:
Moles H3PO4:
35.00mL = 0.03500L * (0.7500mol / L) = 0.2625 moles H3PO4
Moles NaOH:
0.2625 moles H3PO4 * (3mol NaOH / 1mol H3PO4) = 0.07875 moles NaOH
Volume NaOH:
0.07875 moles NaOH * (1L / 0.7500mol) = 0.105L =
105mL of 0.7500M of NaOH are requiredA student pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. She then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. The student performs the experiment one more time but this time she stirs the mixture rapidly.
Answer:
It will go faster each time because she is stirring therefore the water can get to the salt faster than it just sitting at the top
Explanation:
Why is the regression equation not exactly y = 100 • 0.5n?
Answer:
Radioactive decay is a random event.
Explanation:
on edge
Answer:
Radioactive decay is a random event.
Explanation:
Edge 2020
CaBr + KOH – Ca(OH), + KBr (balance first) What mass, in grams, of
CaBr is consumed when 48.00 g of Ca(OH), is produced?
please help asap
Answer:
129.73 g of CaBr₂
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
CaBr₂ + 2KOH –> Ca(OH)₂ + 2KBr
Next, we shall determine the mass of CaBr₂ that reacted and the mass of Ca(OH)₂ produced from the balanced equation. This can be obtained as follow:
Molar mass of CaBr₂ = 40 + (80×2)
= 40 + 160
= 200 g/mol
Mass of CaBr₂ from the balanced equation = 1 × 200 = 200 g
Molar mass of Ca(OH)₂ = 40 + 2(16 + 1)
= 40 + 2(17)
= 40 + 34
= 74 g/mol
Mass of Ca(OH)₂ from the balanced equation = 1 × 74 = 74 g
SUMMARY :
From the balanced equation above,
200 g of CaBr₂ reacted to produce 74 g of Ca(OH)₂.
Finally, we shall determine the mass of CaBr₂ that react when 48 g of Ca(OH)₂ were produced. This can be obtained as follow:
From the balanced equation above,
200 g of CaBr₂ reacted to produce 74 g of Ca(OH)₂.
Therefore, Xg of CaBr₂ will react to produce 48 g of Ca(OH)₂ i.e
Xg of CaBr₂ = (200 × 48)/74
Xg of CaBr₂ = 129.73 g
Thus, 129.73 g of CaBr₂ were consumed.
A metal gas cylinder is heated from 181 K to 296 K. If the original pressure was 256 psi, what is the pressure after heating also in psi?
Answer:
419 psi
Explanation:
Assuming the gas behaves ideally, we can solve this problem by using Gay-Lussac's law, which states:
P₁T₂=P₂T₁Where subscript 1 stands for the initial conditions and 2 for the final ones, meaning that in this case:
P₁ = 256 psiT₂ = 296 KP₂ = ?T₁ = 181 KWe input the data:
256 psi * 296 K = P₂ * 181 KAnd solve for P₂:
P₂ = 419 psiCalculate the [H+] in a solution that has a pH or 5.21
Answer:
[H⁺] = 6.17×10¯⁶ M
Explanation:
From the question given above, the following data were obtained:
pH = 5.21
Concentration of Hydrogen ion [H⁺] =?
The pH of a solution is defined by the following equation:
pH = –Log [H⁺]
With the above formula, we can obtain the concentration of Hydrogen ion [H⁺] in the solution as follow:
pH = –Log [H⁺]
5.21 = –Log [H⁺]
Divide both side by –1
–5.21 = Log [H⁺]
Take the antilog of –5.21
[H⁺] = Antilog (–5.21)
[H⁺] = 6.17×10¯⁶ M
Therefore, the concentration of Hydrogen ion [H⁺] in the solution is 6.17×10¯⁶ M
A weather balloon has a volume of 105L at 0.97 atm when the temperature is 318K. What is the volume
at 293K and 1.05 atm?
Answer:
89 L
Explanation:
Step 1: Given data
Initial pressure (P₁): 0.97 atmInitial volume (V₁): 105 LInitial temperature (T₁): 318 KFinal pressure (P₂): 1.05 atmFinal volume (V₂): ?Final temperature (T₂): 293 KStep 2: Calculate the final volume of the weather balloon
If we assume that the gas inside the balloon behaves as an ideal gas, we can calculate the final volume of the gas using the combined gas law.
P₁ × V₁ / T₁ = P₂ × V₂ / T₂
V₂ = P₁ × V₁ × T₂ / T₁ × P₂
V₂ = 0.97 atm × 105 L × 293 K / 318 K × 1.05 atm = 89 L
& Write five examples of liquid to liquid mixture.
Answer:
huikl
daffafafafafa
How many moles of aluminum oxide (Al2O3) will be produced if 1.5 mole of aluminum (AI) reacts with oxygen? Input a numerical answer only. 4Al + 302 ---> 2Al2O3
Explanation:
The number of moles of Al2O3 formed is approximately 4.25 moles. Second find the limiting reactant. Since O2 has less value that is 2.126 than Al that is 2.287, O2 is the limiting reactant in this reaction.
Help plz:)))I’ll mark u Brainliest
Answer:
11690J
Explanation:
Use formula Q = mL
where:
Q = Energy (J)
m = Mass (g)
L = Latent heat of fusion for water (J/g) = 344J/g
Therefore:
Q = 35.0 x 344
Q = 11690J
define functional group
Answer:
a functional group is a specific group of atoms or bonds within a compound that is responsible for the characteristic chemical reactions of that compound.
Explanation:
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Can someone please solve this question?? Is an element in group 3 likely to bond with an element from group 2?? Explain using the number of balance electrons from each element and the tot number of balance electrons needed to fill an about shell
Answer:
An atom with one or two valence electrons more than a closed shell The number of valence electrons of an element can be determined Groups 3-12 (transition metals), 2* (The 4s shell is complete and cannot hold any more electrons) in explaining the molecular structure of many organic compounds.
Explanation:
Calculate the volume of a gas sample at 273 K and 101.325 kPa if 455 cm of the gas are
collected at 36.0 °C and 97.0 kPa. What is the name of the gas law used in this calculation?
Answer:
The name of the game law used is called the Charles Law
14. The illustration below shows two atoms of a fictitious element (M) forming a diatomic
molecule. What type of bonding occurs between these two atoms?
A. Covalent
B. Hydrogen
C. lonic
D. Polar
Covalent bonding involving covalent bonds is depicted between these two atoms as they form diatomic molecule.
What is a covalent bond?Covalent bond is defined as a type of bond which is formed by the mutual sharing of electrons to form electron pairs between the two atoms.These electron pairs are called as bonding pairs or shared pair of electrons.
Due to the sharing of valence electrons , the atoms are able to achieve a stable electronic configuration . Covalent bonding involves many types of interactions like σ bonding,π bonding ,metal-to-metal bonding ,etc.
Sigma bonds are the strongest covalent bonds while the pi bonds are weaker covalent bonds .Covalent bonds are affected by electronegativities of the atoms present in the molecules.Compounds having covalent bonds have lower melting points as compared to those with ionic bonds.
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2 C6H14 + 19 O2 --> 12 CO2 + 14 H2O
Given 250 g of Oxygen and 50 grams of CoH14 what is the maximum amount of water that can be formed?
• Box 1 = number
• Box 2 = units
Box 3 = Substance
Answer:
4.06 mol H₂O
Explanation:
2C₆H₁₄ + 19O₂ → 12CO₂ + 14H₂OFirst we convert the given masses of reactants into moles, using their respective molar masses:
250 g O₂ ÷ 32 g/mol = 7.81 mol O₂50 g C₆H₁₄ ÷ 86 g/mol = 0.58 mol C₆H₁₄Now we calculate how many O₂ moles would react completely with 0.58 C₆H₁₄ moles, using the stoichiometric coefficients of the reaction:
0.58 mol C₆H₁₄ * [tex]\frac{19molO_2}{2molC_6H_{14}}[/tex] = 5.51 mol O₂As there are more O₂ moles than required (7.81 vs 5.51), O₂ is the reactant in excess. That means that C₆H₁₄ is the limiting reactant.
Now we can calculate how much water can be formed, using the number of moles of the limiting reactant:
0.58 mol C₆H₁₄ * [tex]\frac{14molH_2O}{2molC_6H_{14}}[/tex] = 4.06 mol H₂OCan someone help me out, thanks
Answer:
See EXPLANATION
Explanation:
We must bear in mind that in balancing chemical reaction equations, the number of atoms of each element on the right hand side must be the same as the number of atoms of the same element on the left hand side of the reaction equation. This follows from the law of conservation of mass.
Based on this;
There are two oxygen atoms on the left hand side of the reaction equation, thus total mass of oxygen = 2 * 16 amu = 32 amu
There are two oxygen atoms on the product side of the reaction equation, thus the total mass of oxygen = 2 * 16 amu = 32 amu
.......state Hess law
What are the two sources of electricity? (Supposed to be found in a Bill Nye video)
Answer:
The three major categories of energy for electricity generation are fossil fuels (coal, natural gas, and petroleum)
Explanation:
:)
explane why a stone is compact water has the ability to flow and the fragrance of perfumes spreads?
Answer:
The reason here is due to the variation of states of matter such that Stone which is an example of solid composed of the molecules which are so tightly packed that they dont have the ability to move.So thats why due to the compact arrangement of particles of stone,stone is a compact body while Water is made of particles that have a low force of attraction in between them when compared with solids thats why the particles are freed to move within the volume of water and so thats why water have the ability to flow on the land when force applied such as gravitation.But fragnances are the gaseous matter which have the particles such that so loosely packed that are freed to move randomly at any direction such as air and thats why fragnaces spreads in all the whole volume that provided to them. Due to because of the varation of pressure,intermolecular force of attraction,intermolecular space and other physical properties in all three states thats why the physical appearance of these substances of different states differs.
Hope it helps
0.41g of neon is held in a 200. mL container at 11 °C. Calculate the pressure in atm.
Answer:
2.39 atm
Explanation:
We'll begin by calculating the number of mole in 0.41 g of neon (Ne). This can be obtained as follow:
Mass of Ne = 0.41 g
Molar mass of Ne = 20 g/mol
Mole of Ne =.?
Mole = mass / molar mass
Mole of Ne = 0.41 / 20
Mole of Ne = 0.0205 mole
Next we shall convert 200 mL to L.
1000 mL = 1 L
Therefore,
200 mL = 200 mL × 1 L / 1000 mL
200 mL = 0.2 L
Next, we shall convert 11 °C to Kelvin temperature.
T(K) = T(°C) + 273
T(°C) = 11 °C
T(K) = 11 + 273
T (K) = 284 K
Finally, we shall determine the pressure. This can be obtained as follow:
Mole of Ne (n) = 0.0205 mole
Volume (V) = 0.2 L
Temperature (T) = 284 K
Gas constant (R) = 0.0821 atm.L/Kmol
Pressure (P) =?
PV = nRT
P × 0.2 = 0.0205 × 0.0821 × 284
P × 0.2 = 0.4779862
Divide both side by 0.2
P = 0.4779862 / 0.2
P = 2.49 atm
Therefore, the pressure of the gas is 2.39 atm
Anyone knows gunpowder formula?
i cant seem to figure out ANY of these... help when you can pls :.)
Guided Notes: Types of Chemical Reactions:
1. Synthesis or Combination
A + B à AB
Example:
Magnesium + Oxygen gas à Magnesium Oxide
_________ + _______ à __________
2. Decomposition
AB à A + B
Example:
Calcium Oxide à Calcium + Oxygen
_______ à __________ + __________
3. Single Replacement
A + BX à AX + B
Example:
_________ + _______ à __________ + __________
4. Double Replacement
AX + BY à AY + BX
Example:
_________ + _______ à __________ + _________
5. Combustion
CxHyOz + O2 à CO2 + H2O
Example:
Propane + Oxygen à Carbon dioxide + water
_________ + _______ à __________ + _________
Classify the following chemical reactions:
Sodium and Chlorine gas à Sodium Chloride
_________ + _______ à __________ Type of Reaction: __________________
CaCO3 + HCl à CaCl2 + H2CO3 Type of Reaction: __________________
Al + ZnCl2 à AlCl3 + Zn Type of Reaction: __________________
Fe + O2 à Fe2O3 Type of Reaction: __________________
H2CO3 à CO2 + H2O Type of Reaction: __________________
Octane (C8H10) is burned in oxygen gas to produce
carbon dioxide and gaseous water
______ + _______ à _______ + ________ Type of Reaction: _________________
Answer:
the answer is like same we do last I know the answer I will help you to get more questionable and paste it to you do you know what time you do it me william and paste Now bro hurry up please and then let's go play with me again Go to bed ️ I don't know what to do patch right Now or just a question for you to get more questionable
Refer to the graph below. In order to have a saturated solution, how many grams of potassium nitrate, KNO3, need to be dissolved in 100 grams of water
at 20°C. Select the closest measurement. A.60 B.100 C.30 D.20
Answer:
C. 30.
Explanation:
Hello there!
In this case, according to the definition of the solubility, as the maximum amount of a solute that can be completely dissolved in a solvent without the formation of a precipitate, we can see that at the vertical line of 20 °C, on the KNO3 curve, we can see an intercept at about 30.
Such 30 means that just 30 grams of KNO3 will be completely dissolved in 100 g of water at 20°C, by means of its temperature dependent solubility; and therefore the answer is C. 30.
Regards!
A saturated solution of sucrose in 500.0 mL of boiling water is cooled to 20.0 0C. What mass of rock candy will be formed?
Answer:
1280.5g
Explanation:
A common asteroid is in the first photograph. Haley's Comet is in the second photograph. What can be inferred about comets and asteroids? Answer A Both have orbits around the Earth that are ellipses B Both are miniature planets because they orbit the Sun C Both could be planetary fragments from the beginnings of solar system formation D Both are made of rock, ice, and solar dust from the beginning of the solar system
Answer:
D Both are made of rock ,ice and solar dust from the beginning of the solar system
Answer:
The answer is D
Explanation:
You are picking an order and come across a box of perfume. What should you do? Please choose all that apply
-4. A student learns that all of the particles within an object possess kinetic energy. Based on this fact,
the student can conclude that all of the particles in the object-
A. Contains the same atoms. B. Are hotter than their surroundings C.Are in motion. D. Are covalently bonded
Answer:
C
Explanation:
The correct option is option C. which is "are in motion".
All the particles inside an object have kinetic energy, which implies that the particles are moving. Kinetic energy is the force that drives an object's or its constituent parts in motion. As a result, it can be inferred from this fact that the object's particles are in motion.
Options A, B, and D are not necessarily true based on the given information. The fact that particles have kinetic energy does not imply that they contain the same atoms (option A), are hotter than their surroundings (option B), or are covalently bonded (option D). These characteristics are not directly related to the presence of kinetic energy in particles.
Therefore, option c is the correct option.
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