A gas mixture contains 50% helium and 50% methane by volume at S.T.P. what is the percentage by mass of the methane in the mixture? |
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(a) |
20% |
(b) |
40% |
(c) |
60% |
(d) |
80% |

A gas mixture contains 50% helium and 50% methane by volume at S.T.P. what is the percentage by mass of the methane in the mixture? |
|||||||

(a) |
20% |
(b) |
40% |
(c) |
60% |
(d) |
80% |

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