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15 April, 14:58

How many grams of calcium hydride are needed to form 4.850 g of hydrogen gas? express your answer using four significant figures?

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  1. 15 April, 15:34
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    The number of calcium hydride that are needed to form 4.850 g of hydrogen gas = 101.85 grams

    calculation

    write the equation for decomposition of CaH2

    that is CaH2→ Ca + H2

    find the moles of H2 produced = 4.850/2 = 2.425 moles

    by use of mole ratio between CaH2:H2 which is 1:1 the moles of CaH2 is also 2.425 moles

    mass of CaH2 is therefore = moles x molar mass

    = 2.425 moles x 42 g/mol = 101.85 grams
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