
Concept explainers
Interpretation:
The molecular formula of Lactic acid has to be determined.
Concept Introduction:
The expression to determine molecular weight as per ideal gas equation is given as follows:
Here,
In order to obtain the molecular formula of the compound, Multiply the whole number with the subscript of each element present in the empirical formula.

Answer to Problem 13.75P
The molecular formula of lactic acid is
Explanation of Solution
The formula to convert degree Celsius to kelvin is as follows:
Substitute
The conversion factor to convert
Thus
The conversion factor to convert
Thus,
The expression to determine molecular weight as per ideal gas equation is as follows:
Substitute
Molecular mass is
The formula to convert mass to moles is as follows:
Substitute
Substitute
Substitute
With moles of
The smallest subscript is 0.033297. So, divide each subscript by 0.033297 as follows:
The expression to calculate the empirical formula mass is as follows:
Substitute
The formula to calculate the whole number multiple is as follows:
Substitute
Multiply the subscripts in
The molecular formula is
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