What volume would be occupied by 4.8 g of oxygen gas at 0.50 atm and 133°C? Hint: Determine moles of oxygen gas first.


Answer 1

The volume that would be occupied by oxygen gas is equal to 10 Liters

Given the following data:

Mass = 4.8 g

Pressure = 0.50 atm

Temperature = 133°C to K =

Scientific data:

Molar mass of oxygen gas = 32 g/mol.

Ideal gas constant, R = 0.0821L⋅atm/mol⋅K

To determine the volume that would be occupied by oxygen gas:

First of all, we would determine the number of moles of oxygen gas present.

Number of moles = 0.15 moles

Now, we can find the volume of oxygen gas by the ideal gas law equation;

Volume = 10 Liters

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Answer 2
Answer: Answer will be 1.24 atm

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According to Dalton, what happens to atoms during a chemical reaction? 1. Old atoms are destroyed.
2. Atoms gain or lose energy.
3. Atoms are rearranged.
4.New atoms are created.


The atoms are only rearranged !! So your answer is 3 !!

Dalton gave a theory conservation of mass that signifies this !!

Atoms are rearranged


Given that diatomic chlorine is the most stable form of the element, and that the ΔHf° value for atomic chlorine is +121.7 kJ/mol, calculate the maximum wavelength that can dissociate diatomic chlorine into monoatomic chlorine. What type of radiation (UV-A, UV-B, UV-C) does this wavelength correspond to?



The maximum wavelength of light that can dissociate diatomic chlorine into the monatomic chlorine form is 984 nm.


Given: ΔHf° value for atomic chlorine is +121.7 kJ/mol

1 Step

Converting kJ/mol into kJ (knowing that in 1 mol there is 6.023*10^23 molecules)  

ΔHf° in kJ = 121.7 kJ/mol* 1 mole / 6.023*10^23

ΔHf° = 2.02*10^-22 kJ

ΔHf° = E = 2.02*10^-19 J

2 Step

Converting ΔHf° to a wavelength:

knowing the E = h*C/У

h = 6.626 x 10^-34 J·s

C = 3.00 x 10^8 m/s

У = h*C/E = (6.63 x 10^-34 J·s)(3.00 x 108 m/s) / 2.02*10^-19 J

У = 9.84*10^-7 m = 984 nm

3 Step (What type of radiation?)

UV-A wavelength range = 315 nm to 400 nm

UV-B wavelength range = 280 nm to 315 nm

UV-C wavelength range = 100 nm to 280 nm

This wavelength is not corresponding to any of the wavelength range (UV-A, UV-B, UV-C).


List which observations were qualitative and which were quantitative. Quantitative data is something that can be measured such as; the candle is 3 inches tall and has a diameter of 2 inches. Qualitative data is sensory observations such as; odor, cold, hot, taste, texture, and appearance.



Quantitative= The candle is 3 inches tall and has a diameter of 2 inches.

Qualitative=  odor, cold, hot, taste, texture, and appearance



Qualitative properties are those that can be only observed but not measured in numerical values. These are observed through senses: touch, sight, smell, taste and hear.

For example:

Color, odor, brittleness, taste etc.


Quantitative properties can be measured in numerical values.

For example:

Melting point, boiling point, conductivity, viscosity, density, hardness and solubility.

In short we can say that qualitative is a measure of quality while the quantitative is a measure of quantity.


Which of the following changes depending on the strength of the gravity field it is in? A. None of these
B. Matter
C. Weight
D. Mass


Answer: Weight


Matter is anything that has mass and occupies space.

Weight of an object is the force acting on an object by virtue of its mass.  It has units of dynes , Newton etc.


m= Given mass

g= acceleration due to gravity

Mass is the amount of matter contained in a substance. It can be measured in units of kilograms (kg), grams (g), milli grams (mg) etc.

Thus weight is dependent on strength of gravity field.

Im pretty sure it weight because when we are on different plants with a different amount of gravitational pull our weight changes

hope this helps :)
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