
5.29 What are the densities of the following gases at STP?
(a) CF2Cl2, (b)CO2, (c) HCl

Interpretation:
The densities of the following gases at STP have to be calculated.
Concept Introduction:
- An ideal gas has is a hypothetical gas that is formed by a few molecules so that, its density is low, and the intermolecular forces are null. The model of gas facilitates mathematical calculations to study gases.
- The molar mass is mass expressed in grams of a mol of substance. The molar mass can be expressed is the following way,
Where ni are the atoms number of element i that form the gas molecule gas and Ai is the atomic weight of element i.
- The ideal gas law can be expressed in the following way,
Where P is the gas pressure (atm), V is the gas volume (L), T is the gas absolute temperature (K), n is the moles number of the gas , R is the ideal gas constant (
In the STP conditions, the temperature is 273 K and the pressure is 1 atm.
Answer to Problem 5.29PAE
Solution: a)
b)
c)
Explanation of Solution
Given Information:
The following gases,
a)
1-Calculate the molar mass (M) of CF2Cl2,
2-Calculate the density of CF2Cl2 at STP
b)
1-Calculate the molar mass (M) of CO2,
2-Calculate the density of CF2Cl2 at STP
c)
1-Calculate the molar mass (M) of HCl,
2-Calculate the density of CF2Cl2 at STP
a) The density of CF2Cl2at STP is
b) The density of CO2at STP is
c) The density of HCl at STP is
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