Concept explainers
Interpretation:
Molecular formula of compound used to make PVC and take
Concept Introduction:
Subscript of empirical formula is multiplied by value of
Effusion is explained as movement of the gas molecule through small hole.
Diffusion can be explained as when one gas molecule mix with another gas molecule by random motion.
Graham’s law of effusion gives relation of rate of effusion with molar mass. Rate of effusion and square root of molar mass are inversely related. The mathematical expression is as follows:
Here,

Answer to Problem 3D.8E
The molecular formula for compound used to make PVC and take
Explanation of Solution
Compound PVC has
The expression to determine moles is as follows:
Substitute
Substitute
Substitute
Since each mole value should be divided by smallest value thus divide all mole values by 1.60 to determined subscripts of respective elements.
The subscripts for
The subscripts for
The integer or mixed fraction for
The final empirical formula for PVC is
Let molecular formula of compound is
The expression for molar masses of
Rearrange equation (2) to calculate value of
Substitute
Thus molar mass of
The empirical formula mass can be calculated as follows:
Substitute
The value of
Substitute
Hence, molecular formula for compound is
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Chapter 3 Solutions
ACHIEVE/CHEMICAL PRINCIPLES ACCESS 2TERM
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