A hydrocarbon contains $85.7%$ carbon and $14.3%$ hydrogen by mass, and its relative molecular mass is $56$ . What is its molecular formula? ( $A_{r}$ : C $= 12$ , H $= 1$ .)

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What mass of calcium carbonate, $CaCO_{3}$ , is $0.25$ mol? ( $A_{r}$ : Ca $= 40$ , C $= 12$ , O $= 16$ .)
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