Question

Mass of 7 litres of CO₂ at STP is:

• A. 13.75
• B. 15.75
• C. 12.75
• D. 10.75

Answer 1

The correct option is A

13.75

The explanation for the correct option:

Option A is correct

• The molar mass of CO₂ is 12 + 2(16) = 44g
• We know that the 1 mole of any gas at S.T.P. occupies 22.4 l.
• Then, a Mass of 7 liters of CO₂ is 44 ÷ 22.4 = 13.75,

The explanation for the incorrect option:

Option B is incorrect

Because after calculating we get the answer which is 13.75.

Option C is incorrect

Because after calculating we get the answer which is 13.75.

Option D is incorrect

Because after calculating we get the answer which is 13.75.