It is found that 250.mL of a gas at STP has a mass of 0.700 g.What is the molar mass?
A)62.7 g/mol
B)2.80 g/mol
C)15.9 g/mol
D)11.2 g/mol
E)128 g/mol

Question

Quizplus · Accepted Answer

At STP (Standard Temperature and Pressure), 1 mole of any gas occupies 22.4 L. Given that 250 mL (or 0.250 L) of a gas has a mass of 0.700 g, we can find the molar mass by first determining how many moles are present in 0.250 L and then using the mass to find the molar mass. Since 22.4 L contains 1 mole, 0.250 L contains $ \frac{0.250}{22.4} $ moles. The molar mass (M) is calculated as $ M = \frac{mass}{moles} $, which gives $ M = \frac{0.700 g}{\frac{0.250}{22.4} moles} = 62.7 g/mol $.

It Is Found That 250