A gaseous compound has a density of 1.89 g/L at 27.4 °C and 1.80 atm. What is the molar mass of the compound?

Answer 1

R = 0.0821 Latm/molK, T = 300.4 K

PV=nRT

Molar mass is g/mol. Let's assume a 1 L sample, which means you have 1.89g.

1.80 atm * 1L = n * 0.0821 Latm/molK * 300.4 K

n = 0.0730 mol

Take the number of grams and divide by moles. 1.89 g / .0730 mol = 25.9 g/mol