If 250.0 mL of a gas at STP weighs 2.00 g,what is the molar mass of the gas? A)28.0 g.mol^-¹ B)179 g.mol^-¹ C)8.00 g.mol^-¹ D)56.0 g.mol^-¹ E)44.8 g.mol^-¹

Question

Quizplus · Accepted Answer

At STP, 1 mole of gas occupies 22.4 L. Therefore, 250.0 mL (or 0.250 L) of gas is 0.250/22.4 moles. The molar mass is calculated as mass/moles, which is 2.00 g divided by (0.250/22.4) moles, resulting in approximately 179 g/mol.

If 2500 ML of a Gas at STP Weighs 2