The density of sulfur vapor at 1273 K and 740 torr 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 moles:

n = PV/RT

We can then use the molar mass formula, M = m/n, to solve for molar mass:

M = m/(PV/RT)

First, we need to convert temperature to Kelvin:

1273 K = 1000°C + 273.15 = 1273.15 K

Plugging in the given values, we get:

M = (0.5977 g/L) / [(740 torr) / (760 torr/atm) * (0.08206 L*atm/mol*K) * (1273.15 K)]

M = 63.97 g/mol

Rounding to the nearest whole number gives us choice B, 64 g/mol, as the correct answer.

The Density of Sulfur Vapor at 1273 K and 740