What is the molecular weight (g/mol)of an unknown gas that has a density of 3.59 g/L at STP? A)7.37 B)87.9 C)0.0879 D)80.5 E)8.15 × 10³

Question

Quizplus · Accepted Answer

Using the Ideal Gas Law: PV = nRT, we can calculate the number of moles of the gas:

PV = nRT
(1 atm)(22.4 L) = n(0.08206 L·atm/mol·K)(273 K)
n = 1 mole

Now we can use the formula: d = m/V, where d is density, m is mass and V is volume.

m/V = d
m/22.4 L = 3.59 g/L
m = 80.5 g

Finally, we can calculate the molecular weight using the formula: MW = m/n.

MW = 80.5 g/1 mole
MW = 80.5 g/mol

Therefore, the molecular weight of the unknown gas is 80.5 g/mol. The answer is D.

What Is the Molecular Weight (G/mol)of an Unknown Gas That