Question

What is the mass, in pounds, of 389 mL of a gas that has a density of 1.29 g/L?

Answer 1

Answer: Mass of gas is 0.001 pounds.

Explanation:

Density is defined as the mass contained per unit volume.

$Density=\frac{mass}{Volume}$

Given : Mass of gas = ?

Density of gas = $1.29g/L$

Volume of gas = 389 ml = 0.389 L     (1L=1000ml)

Putting in the values we get:

$1.29g/L=\frac{mass}{0.389L}$

$mass=0.5grams$  

$mass=0.5\times 0.002lb=0.001lb$       (1g =0.002 lb)

Thus the mass of gas is 0.001 pounds.