To solve this, we will use the formula:
ΔQ = m / M * Cv * ΔT, where m is the mass of the gas, M is the molar mass, Cv is the heat capacity at constant volume (for helium 12.5 J / mol * K)
M will be 2 (since helium is an inert gas, the mass of an atom is 2)
ΔQ = 16 * 10 ^ -3 / 2 * 10 ^ -3 * 12.5 * 20 = 8 * 12.5 * 20 = 2000 KJ.
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