What is the decrease in volume of air when pyrogallol is shaken with 30.00cm³ of air?

A. 15.00cm³
B. 6.30cm³
C. 0.63cm³
D. 0.06cm³

Correct Answer:

Option B – 6.30cm³

Explanation

% volume of O2 in air = 21%
∴ (21/100) X 30 = 6.3