select the correct answer. an adult human lung has a volume of 2.9 liters. if its volume decreases to 1.2…

select the correct answer. an adult human lung has a volume of 2.9 liters. if its volume decreases to 1.2 liters and it contains 0.049 mole of air after it exhales, how many moles of air does it contain when full? a. 0.025 mol b. 0.041 mol c. 0.083 mol d. 0.12 mol e. 0.14 mol reset next

select the correct answer. an adult human lung has a volume of 2.9 liters. if its volume decreases to 1.2 liters and it contains 0.049 mole of air after it exhales, how many moles of air does it contain when full? a. 0.025 mol b. 0.041 mol c. 0.083 mol d. 0.12 mol e. 0.14 mol reset next

Answer

Explanation:

Step1: Set up proportion

Assume the number of moles when full is $n$. According to Avogadro's law (at constant temperature and pressure, $V_1/n_1 = V_2/n_2$), we have $\frac{2.9}{n}=\frac{1.2}{0.049}$.

Step2: Solve for $n$

Cross - multiply to get $1.2n=2.9\times0.049$. Then $n=\frac{2.9\times0.049}{1.2}$. Calculate $2.9\times0.049 = 0.1421$, and $n=\frac{0.1421}{1.2}\approx0.12$.

Answer:

D. 0.12 mol