9. Given the following reaction: 2NO (g) + O2 (g) → 2NO2 (g) How many liters of gaseous oxygen are needed

to produce 4.50 L of gaseous nitrogen dioxide, if both gases are being measured at STP?

2.25L of O2

Explanation:

2NO (g) + O2 (g) → 2NO2 (g)

From the equation,

1L of O2 produced 2L of NO2.

Therefore, yL of O2 will produce 4.50L of NO2 ie

yL of O2 = 4.50/2 = 2.25L

Therefore, 2.25L of O2 are needed.