From the conversation with the doctor, Xiaojiang learned that adults need about 8L oxygen per minute. How many liters of air do adults need per minute? What is the mass of 8L oxygen in standard condition? What is the mass of air required? (oxygen density = 1.429g/l, air density = 1.293g/l)

From the conversation with the doctor, Xiaojiang learned that adults need about 8L oxygen per minute. How many liters of air do adults need per minute? What is the mass of 8L oxygen in standard condition? What is the mass of air required? (oxygen density = 1.429g/l, air density = 1.293g/l)

According to the calculation of air volume fraction, nitrogen accounts for about 45% and oxygen accounts for about 15%. From the meaning of the question, the volume of air: 8L △ 15 = 40L; according to the density formula, the mass of 8L oxygen under standard condition is: 8L × 1.429g/l = 11.432g.40l, and the mass of air is: 40L × 1.293g/l = 51.72g, so the answer is: 40L; 11.432g.51.72g