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12 June, 23:59

How many moles of water, H2O, contain 2.0*1022 molecules of water? (See the hints for assistance in interpreting scientific notation.)

Express the quantity in moles to two significant figures.

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  1. 13 June, 01:57
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    In this question, what are we really being asked? We are being asked about the number of moles there in 2.0x10^22 molecules of H2O.

    We are going to use the formula,

    Number of moles = Number of molecules / Avogadro's number

    We have the number of molecules: 2.0 x 10^22

    Avogadro's number: 6.02 x 10^23

    Now we will plug in our information in a scientific calculator:

    (2.0 x 10^22) / (6.02 x 10^23) = 0.03 moles is our answer.
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