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Which one of the following pairs of gases contain the same number of molecules at S.T.P.

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11 grams of CO₂ and 14 grams of CO

14 grams of C₂H₄ and 16 grams of methane

16 grams of oxygen and 17 grams of Hydrogen sulphide

4 grams of helium and 4 grams of hydrogen

answer is C.

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Which gases have same number of moles they have same number of molecules.

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