The mass of the helium can be calculated using the formula:
\[ \text{Mass} = \text{Volume} \times \text{Density} \]
Given that the volume of helium is 2,000 cubic meters and the density of helium is 0.1765 kilograms per cubic meter, we can substitute these values into the formula:
\[ \text{Mass} = 2,000 , \text{m}^3 \times 0.1765 , \text{kg/m}^3 = 353 , \text{kg} \]
Therefore, the balloon contains:
353
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