
Interpretation:
The molecular formula of the compound is to be determined.
Concept introduction:
Molar mass is the mass of one mole of a substance in grams. Molar mass of a compound is equal to the sum of the
The relation between molarity and osmotic pressure is mathematically expressed as follows:
Here,
The number of moles of solute are calculated as follows:
The molar mass of unknown solute is calculated as follows:
The molecular formula is the formula that gives the exact number of atoms present in that molecule.

Answer to Problem 86QP
Solution:
Explanation of Solution
Given information:
The molarity using osmotic pressure is mathematically calculated as follows:
Here,
Molarity can be determined by substituting the values in the above equation as follows:
The volume of the solution is
The molar mass of unknown solute is calculated as follows:
Now, calculate the number of moles of various constituents(assuming mass in
Moles of carbon are calculated as follows:
Moles of hydrogen are calculated as follows:
Moles of oxygen are calculated as follows:
Moles of nitrogen are calculated as follows:
The molar ratio of carbon, hydrogen, oxygen, and nitrogen is
Therefore, the empirical formula of the compound is
The empirical formula mass is calculated as follows:
Divide the molar mass by the empirical formula mass to get the value of
Now, the molecular formula can be obtained using the expression as follows:
The molecular formula of the compound is
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Chapter 13 Solutions
Chemistry
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