Answer to Question #157236 in General Chemistry for Natalia Olszewska

Question

What volume of oxygen at STP will be needed to react with 3.5L of acetylene gas (C2H2) at STP?

Answer 1

2C₂H₂(g) + 5O₂(g)$\to$ 4CO₂(g) +2H₂O(g)

22.4L=1mole

$\therefore$ 3.5L=3.5/22.4

=0.15625 moles of C₂H₂.

If 2=0.15625 moles

$\therefore$ 5=?

5*0.15625/2

=0.390625 moles of O₂.

If 1 mole=22.4L

$\therefore$ 0.390625 moles=?

0.390625 moles*22.4L

=8.75L