Question

Calculate the molar mass of a vapor that has a density of 7.125 g/L at 13 °C and 743 torr.

Express the molar mass in grams per mole to three significant digits.

Answer 1

Step-by-step explanation:

Let’s start by converting the given information to the terms necessary: 290* K, .978 atm, 7.125 g/L

To solve this problem, we’re going to use the formula PM=dRT (R always = .0821)

so, (.978)M=(7.125)(.0821)(290)

Divide both sides by .978

M = 173 g/mol (keeping with 3 sig figs)