Question

Helium has a density of 1.79 x 10-4 g/mL at standard temperature and pressure. A balloon has a volume of 6.3 liters. Calculate the mass of helium that it would take to fill the balloon. Be sure to follow significant figure rules when calculating the answer.

Answer 1

The mass of Helium that it would take to fill the balloon is 1.1277 grams of helium

calculation

mass = density x volume

Density = 1.79 x 10 ⁻⁴ g/ml

Volume = 6.3 L

• convert volume into ml to make the unit uniform

that is 1 L = 1000 ml

6.3 L =? L

by cross multiplication

= ( 6.3 L x 1000 ml) / 1 L = 6300 ml

mass is therefore = 1.79 x 10⁻⁴ g/ml x 6300 ml= 1.1277 grams