A 5.00 liter sample of gas measured at 27.0°C and 1.25 atm of pressure has a mass of 10.13 g.What is the molecular weight of the gas in u?

Question

Quizplus · Accepted Answer

To find the molecular weight (M) of the gas, use the ideal gas law: PV = nRT. First, convert the temperature to Kelvin (27°C + 273 = 300 K). Then, calculate the number of moles (n) using n = PV/RT, where R = 0.0821 L·atm/mol·K. Substitute P = 1.25 atm, V = 5.00 L, and T = 300 K to find n. Finally, use the formula M = mass/n to find the molecular weight: M = 10.13 g / n. The calculation yields approximately 39.9 u.

A 500 Liter Sample of Gas Measured at 27