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2 December, 08:24

What mass of helium is in a 2.00L ballon at STP

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  1. 2 December, 10:19
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    0.357 g He

    Explanation:

    1 mol of gas at STP = 22.4 L

    2.00 L * 1 mol/22.4 L = 0.08929 mol He

    M (He) = 4.00 g/mol

    0.08929 mol He * 4.00 g / 1 mol He = 0.357 g He
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