What is the mass of the helium (in kg)?

Question

A large balloon used to sample the upper atmosphere is filled with 335 m³ of helium. What is the mass of the helium (in kg)?

Answer 1

The process to tackle this problem could begin with analyzing your units.

1. The volume of Helium sample is 335 m^3, then consider that density of any given sample is mass/volume
2. Find the density of Helium (I searched it up on Google) —> .164 kg/m^3
3. What are you solving for? —> total mass of Helium sample
4. Use given and known information to find the total mass. If you’re confused on what calculation to make to get the total mass, always look back at your units:

(.164 (kg/m^3)) x (335 (m^3)) = 54.94 kg

54.94 Kg would be the final answer, in the calculation above, the m^3 canceled out, as it was in the denominator on the left and was multiplied by m^3 in the numerator on the right, yielding a Kg number answer.