Question

How many moles of chlorine gas at 120°C and 33.3 atm would occupy a vessel of 22.0L?

A) 0.4 mol
B) 0.7 mol
C) 0.5 mol
D) 0.8 mol

Answer 1

To calculate the number of moles of chlorine gas in the vessel, we use the molar mass of chlorine and the molar volume of an ideal gas at standard temperature and pressure (STP). We find that the number of moles of chlorine gas is 0.8 mol.

Step-by-step explanation:

We begin by calculating the amount of chlorine in the cylinder using the molar mass of chlorine (70.906 g/mol):

1 mol Cl₂ 20.0 g Cl₂x 70.90 Og Cl₂ = 1.70 × 10²³ molecules Cl

Now we can use the molar volume, 22.4 L/mol, because the gas is at STP:

22.4 L 1 mol Cl₂

The volume of 1 mol of an ideal gas is 22.41 L at 0 °C and 1 atm pressure.