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30 January, 19:22

How many moles of aluminum are needed to make 9 moles of molecular hydrogen? given the reaction: 2 al + 6 hcl → 2 alcl3 + 3h2 6 moles 4 moles 3 moles 2 moles none of the above?

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  1. 30 January, 19:43
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    1) Chemical equation

    2Al + 6 HCl - - - > 2Al Cl3 + 3 H2

    2) molar ratios

    2 mol Al : 3 moles H2

    3) Proportion

    2 mol Al / 3mol H2 = x / 9 mol H2

    4) Solve for x

    x = 9 mol H2 * 2 mol Al / 3 mol H2 = 6 mol Ag

    Answer: 6 moles
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