The density of sulfur vapor at 1273 K and 740 mm Hg is 0.5977 g/L. Its molar mass is ________.

Question

Quizplus · Accepted Answer

Using the ideal gas law: PV = nRT

We can rearrange to solve for n/V (molar density):

n/V = (P/R*T)

Substituting the given values:

n/V = (740 mmHg / 62.36 L*mmHg/mol*K * 1273 K) = 0.009294 mol/L

Finally, we can use the molar mass formula:

molar mass = (mass of sample) / (moles in sample)

Since the density is given in g/L, we can assume a 1 L sample:

molar mass = (0.5977 g) / (0.009294 mol) = 64.29 g/mol

So the molar mass of sulfur vapor is approximately 64 g/mol. The closest choice is B, 64.

The Density of Sulfur Vapor at 1273 K and 740