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16 May, 08:25

Based on the balanced reaction 4Cr+3O2=2Cr2O3 how many grams of Cr (MM=52.00g/mol) will react with 5.10x10^2 grams of O2 (MM=32.00g/mol) in complete

Scientific notation

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  1. 16 May, 09:22
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    Grams of Cr that react are 11,05x10*2 g

    Explanation:

    4Cr + 3O2 → 2Cr2O3

    This equation means that 4 moles of Cr, react with 3 moles of O2.

    My mass of O2 is 5,1x10*2g but I need to know the moles.

    Mass / Molar mass = Moles

    5,1x10*2g / 32.00g/mol = 15,9 moles of O2

    So the rule of three is

    If 3 moles of O2 __ react with __ 4 moles of Cr

    15, 9 moles of O2 ___ react with___?

    (15,9. 4) / 3 = 21,2 moles of Cr.

    To know the mass, I have to multipply, the molar mass to the moles.

    Molar mass. Moles = Mass

    52g/mol. 21,2 moles = 1105 gr.

    In scientific notation I can write 11,05x10*2 g
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