Question

The mass of an evacuated 255 mL flask is 143.187 g. The mass of the flask filled with 264 torr of an unknown gas at 25°C is 143.288 g Revie y Part A Calculate the molar mass of the unknown gas. 1 Α�

Answer 1

The molar mass of the unknown gas is 8.86 g/mol.

Step-by-step explanation:

To calculate the molar mass of the unknown gas, we need to find the difference in mass between the flask filled with the gas and the empty flask. The mass difference is 143.288 g - 143.187 g = 0.101 g. Since the volume of the flask is 255 mL, or 0.255 L, we can calculate the molar mass using the formula:

Molar mass = mass difference / volume

Molar mass = 0.101 g / 0.255 L = 0.396 g/L. To convert the molar mass to grams per mole (g/mol), we need to multiply it by 22.4 L/mol:

Molar mass = 0.396 g/L * 22.4 L/mol = 8.86 g/mol.