An organic compound is to be 24.78% C, 2.08% H, and 73.14% Cl by mass.At 373 K and 0.987 atm, 0.800 g of this gas occupies 256 mL.How many moles of gas are present, and what is its molecular formula?

Question

Quizplus · Accepted Answer

First, calculate the moles of gas using the ideal gas law: $PV = nRT$, where $P = 0.987 \, \text{atm}$, $V = 0.256 \, \text{L}$, $R = 0.0821 \, \text{L atm mol}^{-1} \text{K}^{-1}$, and $T = 373 \, \text{K}$. Solving for $n$ gives approximately $0.00825 \, \text{mol}$. To find the molecular formula, calculate the molar mass using the given mass percentages and compare it to the empirical formula mass. The correct molecular formula is $C_1H_4Cl$, which matches the information given and the calculated moles.

An Organic Compound Is to Be 24