Question

What is the volume of 1.60 grams of O2 gas at STP? (5 points)

1.72 liters
1.45 liters
1.32 liters
1.12 liters

Answer 1

1mol of any gas at STP contains 22.4L

moles of O_2

• Given mass/molar mass
• 1.6/32
• 0.05mol

Now

Volume of O_2:-

• 0.05(22.4)
• 1.120L

Option D

Answer 2

• 1.12 liters

Step-by-step explanation:

Calculating number of moles

• Molar mass of O₂ = 32 g
• n = Given weight / Molar mass
• n = 1.6/32
• n = 0.05 moles

At STP

• One mole of O₂ occupies 22.4 L
• Therefore, 0.05 moles will occupy :
• 22.4 L x 0.05 = 1.12 L