2NaNO3 → 2NaNO2 + O2. From the equation above, what is the volume of oxygen produced at s.t.p. when 8.5g of 2NaNO3 is heated until no further gas is evolved? (2NaNO3 = 85, molar volume of gases at s.t.p. = 22.4dm3)

A. 1.12dm3
B. 2.24dm3
C. 4.48dm3
D. 11.2dm3
E. 22.4dm3

Correct Answer: Option A

A. 1.12dm3