In the reaction of CO₂(g) and solid sodium peroxide (Na₂O₂), solid sodium carbonate (Na₂CO₃) and oxygen gas are formed. This reaction is used in submarines and space vehicles to remove expired CO₂(g) and to generate some of the O₂(g) required for breathing. Assume that the volume of gases exchanged in the lungs equals 4.0 L/min, the CO₂ content of expired air is 3.8% CO₂ by volume, and the gases are at 25 °C and 735 mmHg. If the CO₂(g) and O₂(g) in the above reaction are measured at the same temperature and pressure, 

(a) How many milliliters of O₂(g) are produced per minute and 

(b) At what rate is the Na₂O₂(s) consumed, in grams per hour?