To find the mass of helium in the weather balloon, you can use the formula:
\[ \text{mass} = \text{volume} \times \text{density} \]
Given that the volume of helium is 2,850 cubic meters and the density of helium is 0.1685 kilograms per cubic meter, you can calculate the mass:
\[ \text{mass} = 2,850 , \text{m}^3 \times 0.1685 , \text{kg/m}^3 \]
Calculating this:
\[ \text{mass} = 2,850 \times 0.1685 = 480.225 , \text{kg} \]
Rounding to the nearest whole number:
\[ \text{mass} \approx 480 , \text{kg} \]
So, the answer is:
480
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