Khan Academy Chem/Phy Ques "Ideal gases in medicine"

[pch]

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Given the above info from the passage the question is:

Based on how the canisters are labeled, how would you rank the heat capacities of the gases at constant volume C v,?

I know the equation is Q=CΔT and I'm looking for C. I know C=mc (where c is the specific heat) but with only the above chart, how do I find C?

Thanks!