HELP ME WITH ONE OR BOTH OF THESE QUEATIONS PLEASEEEE
Answer:
2. 181.25 K.
3. 0.04 atm.
Explanation:
2. Determination of the temperature.
Number of mole (n) = 2.1 moles
Pressure (P) = 1.25 atm
Volume (V) = 25 L
Gas constant (R) = 0.0821 atm.L/Kmol
Temperature (T) =?
The temperature can be obtained by using the ideal gas equation as illustrated below:
PV = nRT
1.25 × 25 = 2.1 × 0.0821 × T
31.25 = 0.17241 × T
Divide both side by 0.17241
T = 31.25 / 0.17241
T = 181.25 K
Thus, the temperature is 181.25 K.
3. Determination of the pressure.
Number of mole (n) = 10 moles
Volume (V) = 5000 L
Temperature (T) = –10 °C = –10 °C + 273 = 263 K
Gas constant (R) = 0.0821 atm.L/Kmol
Pressure (P) =?
The pressure can be obtained by using the ideal gas equation as illustrated below:
PV = nRT
P × 5000 = 10 × 0.0821 × 263
P × 5000 = 215.923
Divide both side by 5000
P = 215.923 / 5000
P = 0.04 atm
Thus, the pressure is 0.04 atm
How many hydrogen atoms are found in the
hydrate (NH4)3PO4.5H2O?
Answer:
22
Explanation:
3x4+ 5x2
A company known as arten industries is wanting to build a factory in the watershed that is pictured
if 5.0g zinc reacts with 10.0 g hci to produce h2 gas and znci2 according to the following equation zn=2hci znci2 + h2 what is the limiting reactant and how many grams of h2 will be produced
Answer: The mass of [tex]H_2[/tex] produced is 0.153 g
Explanation:
The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ......(1)
For zinc:Given mass of zinc = 5.0 g
Molar mass of zinc = 65.38 g/mol
Putting values in equation 1, we get:
[tex]\text{Moles of zinc}=\frac{5.0g}{65.38g/mol}=0.0765mol[/tex]
For HCl:Given mass of HCl = 10.0 g
Molar mass of HCl = 36.46 g/mol
Putting values in equation 1, we get:
[tex]\text{Moles of HCl}=\frac{10.0g}{36.46g/mol}=0.274mol[/tex]
The given chemical equation follows:
[tex]Zn+2HCl\rightarrow ZnCl_2+H_2[/tex]
By stoichiometry of the reaction:
If 1 mole of zinc reacts with 2 moles of HCl
So, 0.0765 moles of zinc will react with = [tex]\frac{2}{1}\times 0.0765=0.153mol[/tex] of HCl
As the given amount of HCl is more than the required amount. Thus, it is present in excess and is considered as an excess reagent.
Thus, zinc is considered a limiting reagent because it limits the formation of the product.
By the stoichiometry of the reaction:
If 1 mole of zinc produces 1 mole of [tex]H_2[/tex]
So, 0.0765 moles of zinc will produce = [tex]\frac{1}{1}\times 0.0765=0.0765mol[/tex] of [tex]H_2[/tex]
We know, molar mass of [tex]H_2[/tex] = 2 g/mol
Putting values in above equation, we get:
[tex]\text{Mass of }H_2=(0.0765mol\times 2g/mol)=0.153g[/tex]
Hence, the mass of [tex]H_2[/tex] produced is 0.153 g
somebody please help?
If the limiting reactant in a chemical reaction is impure, what will happen to the percentage yield of the product?
Answer:
it may also become impure,I think.
How many particles are in 7.07x10^-6 moles of a substance?
Answer:
4.25*10^18
Explanation:
1 mole =6.023*10^23 particles
so 7.07*10^-6 mole=6.023*10^23*7.07*10^-6 particles=4.25*10^18 particles
Which is most likely a physical change?
Answer:
Examples of physical change include changes in the size or shape of matter. Changes of state—for example, from solid to liquid or from liquid to gas—are also physical changes. Some of the processes that cause physical changes include cutting, bending, dissolving, freezing, boiling, and melting.
Explanation:
How is wind speed indicated? What is the unit used to define wind speed?
Answer:
AnemometerknotExplanation:
Instrument used to measure wind speed are known as anemometer and can record wind speed, direction, and strength. The normal unit of wind speed is knots (nautical miles per hour)
Why is one side of the moon called "the dark side of the moon"? O A. The moon's rotation time is exactly half the time of its revolution. B. The moon's rotation time is exactly twice the time of its revolution. O C. The moon's rotation and revolution take the same time.
Answer:
The moon's rotation and revolution take the same time.
Explanation:
the moon's rotation and orbit is closely synced-up with our planet's.
What is a mixture called when it has its different components mixed unevenly within the substance?
Heterogeneous mixture
Homogeneous mixture
Impure mixture
Pure mixture
Answer:
Heterogeneous mixture...is the answer
The dude above me is right. I thought he was wrong, so I put A but it turns out he was right!
This chemical reaction follows the law of conservation of mass. CaO(s) + CO2(g) - CaCO3(s) How much CaCO, will be formed if 2.2 grams of CaO are used for this reaction? Assume there are enough reactants to complete the reaction. The final answer should be rounded to one place after the decimal point.
4.3 grams 2.2 grams 1.1 grams 3.9 grams
please answer quick!
Answer:
the answer is 1.1grams is the currect ans
According to the law of conservation of mass, 1.1 grams of calcium carbonate are formed if 2.2 grams of CaO are used for this reaction.
What is law of conservation of mass?According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .
Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.
Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.If 56 g CaO gives 46.2 g calcium carbonate then 2.2 g CaO will give 2.2×46.2/56=1.1 g.
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3. In a neutral solution, the [H+] is
zero
O 10-14M
O equal to [OH-]
O
1 x 107M
Answer:
a neutral solution has a pH of 7.
ph=-log(H+)
Explanation:
hence (H+)
=10⁷mol/dm³
Explain the difference between solid,liquid an gaseous in the theorotical
Answer:
Difference between Solid Liquid and Gases
Solids Liquids Gases
Highly Strong intermolecular forces between the molecules, leads to a definite volume in Solids. The intermolecular forces are stronger than gases but weaker than solids. The intermolecular forces are practically non-existent. Thus, there is no definite volume.
Solids have a definite shape to them. Liquids do not have a definite shape. Gases do not have a definite shape.
The intermolecular space between solids is absent. The intermolecular space is moderate but present. The intermolecular space is free-flowing and plenty.
The force of attraction between the molecules is incredibly high. The force of attraction between molecules is pretty moderate. There is no intermolecular force of attraction between the molecules.
During which phase change does the entropy of a sample of H2O increase?
1. H2O(g) -> H2O(l)
2. H2O(g) -> H2O(s)
3. H2O(l) -> H2O(g)
4. H2O(l) ->H2O(s)
Answer: 3. H2O(l) -> H2O(g)
Explanation: Entropy is a measure of the randomness or disorder a substance. Gasses have the greatest amount of entropy and solids have the least amount of entropy. The entropy of a sample of H2O increases as liquid water evaporates and changes to a gas.
The entropy of a sample of H2O increases when the phase of change that is H2O(l) -> H2O(g) occurs. This is because entropy increases when a substance undergoes sublimation (solid to gas) or evaporation (liquid to gas).
What is meant by entropy?The entropy of an object is a measure of the amount of energy that is unavailable to do work.Entropy depends upon the randomness of molecules, number of molecules, and heat content. During which phase does entropy increase?A substance in the solid phase has low entropy.A substance in the liquid phase has medium entropy.A substance in the gas phase has high entropy.When a substance goes from a solid to a gas (sublimation) or from a liquid to a gas (evaporation), entropy increases.When the given sample of H2O changes its phase from liquid to gas, the entropy increases. It also happens when it changes from solid to gas.
Thus, option 3: H2O(l) -> H2O(g), the entropy increases.
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Chem pls help me thanks very much
Answer:
Flourine reacts with Sodium bromide to give Silver flourine and Bromine
Hope u understand
Thank You
Please mark as brainliest
Answer:
posaaaaaaaaaaaaaaaaaaaaa
Too much Carbon Dioxide in the atmosphere is a bad
thing. However, too little is also bad. Explain why it is important
for Carbon Dioxide to always exist in the atmosphere. Give specific examples of what it is used for to support your response.
Answer:
CO2 is an evil necessary element. co2 is needed for our survival. we need food for survival and food is produced by the plants through photosynthesis. for photosynthesis to take place co2 is one of the vital element. so no co2,no photosyntheseis maeans no food. no food no one will survive.
Please help. Very Confused. No links and need explanation please!
Label the highlighted substance with the term that best describes its behavior.
Answer Choices:
Arrhenius Acid Only
Arrhenius Base Only
Bronsted Lowry Acid Only
Bronsted Lowry Base Only
Both Arrhenius Acid and Bronsted Lowry Acid
Both Arrhenius Base and Bronsted Lowry Base
Answer:
Both Arrhenius Base and Bronsted Lowry Base
Both Arrhenius Acid and Bronsted Lowry Acid
Arrhenius Acid Only
Arrhenius Base Only
Bronsted Lowry Acid Only
Bronsted Lowry Base Only
Explanation:
Question 4 of 10
Which molecule is hexanal?
ОА, НС
ОН
В.
||
Ос. Н?
нсон
D.
Answer:
Hexanal, once commonly called caproic aldehyde, is a six-carbon straight-chain aldehyde. It is a clear liquid with an atmospheric-pressure boiling point of 131 ºC
Answer:
the answer is B the biggest one
Explanation:
HELPPPPPP ASAP FDHTRFHBGFB
Answer:
is your answe b?
Explanation:
Im really asking
A solution contains 2.38 g of magnesium chloride, MgCl, in 500 cm3 of solution
What is the concentration of
chloride ions in g/dm3?
Answer:
3.54g Cl-/dm³
Explanation:
To solve this question we must, as first, find the mass of chloride ions finding first, the moles of MgCl2. Then, we must convert the cm³ to dm³ (1cm³ = 0.001dm³).
Moles MgCl2 -Molar mass: 95.211g/mol-
2.38g * (1mol / 95.211g) = 0.0250 moles MgCl2
Moles Cl-:
0.0250 moles MgCl2 * (2mol Cl- / 1mol MgCl2) = 0.0500 moles Cl-
Mass Cl- -Molar mass: 35.45g/mol-:
0.0500 moles Cl- * (35.45g / mol) = 1.77g of chloride ions
dm³:
500cm³ * (0.001dm³ / 1cm³) = 0.500dm³
The concentration is:
1.77g of chloride ions / 0.500dm³ =
3.54g Cl-/dm³How will amino acids made with isotopes help scientists to answer this question?
Answer:
Proteins are made up of 20 amino acids. How an Isotope Technique Helps Determine Protein Quality. However be produced by the body and therefore are participated in the labelling process.
Explanation:
Which of the following diagram is the correct electron dot diagram for AL
Answer:
the answer is a
Explanation:
Which type of energy transfer allows the Sun to warm Earth?
C. Radiation is the answer.
As it can happen in vacuum also
Answer: Radiation
Explanation:
but whoever floosc is hmmmm you is fine
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(reply w the answer or get reported) Ty if you answer this
Answer:
D. 34.5g
Explanation:
Using the following formula to calculate the mass of 1.5moles of sodium (Na);
Mole = mass/molar mass
Molar mass of Na = 23g/mol
mass = mole × molar mass
Mass of Na = 1.5mol × 23g/mol
Mass of Na = 34.5g
Se encuentra en los animales marinos, es un gas incloro de olor desagradable muy parecido al del pescado podrido
Answer:
Metilaminas
Explanation:
Las metilaminas a menudo están presentes en los tejidos corporales de organismos marinos como crustáceos, moluscos y en todos los peces marinos como N-óxido de trimetilamina, donde actúan para estabilizar la proteína que se desestabiliza por la presión y también se cree que actúa como un depresor del punto de congelación. en peces polares
Las metilaminas tienen olor a pescado podrido, basura o huevos podridos, de modo que una acumulación de metilamina en el cuerpo da como resultado la liberación de un olor a pescado en la amplitud, el sudor y la orina de un individuo
A 0.520 g sample of an unknown nonelectrolyte compound is dissolved in 4.12 g of lauric acid (Kf = 3.90 °C/m). The freezing point depression is determine to be 4.20 °C. What is the molar mass of the compound?
The molar mass of the unknown nonelectrolyte compound is
Using the formula;
∆T = K m i
Where;
K = freezing point depression constant
m = molality of the solution
i = Van't Hoft factor
Note that i = 1 since the compound is a nonelectrolyte.
To find molality;
Number of moles = 0.520 g/Molar mass
Let the molar mass of the unknown compound be MM
Number of moles = 0.520 g/MM
Number of kilograms of solvent = 4.12 g/1000 = 0.00412 Kg
Molality = 0.520 g/MM * 1/0.00412 Kg
Freezing point depression is 4.20 °C
To find the molar mass of the compound;
4.20 °C = 3.90 °C/m * 0.520 g/MM * 1/0.00412 Kg
4.20 = 492.23/MM
MM = 492.23/4.20
MM = 117.19 g/mol
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The specific heat capacity of concrete is 0.880 J/g °C
Calculate the heat added to 3 g of concrete if the temperature increased by 0.64 °C
Use the equation q=mcT
If you can please show work thanks
Answer:
this is a required answer. look it once.
An element X is found to have atomic mass of Y amu, and it is found that Y is 6.66 times
greater than the atomic mass of carbon-12. Identify X and Y.
Answer:
use grahamns law to get the answer