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26 June, 16:22

How many molecules are in 5.00 grams of NH3?

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  1. 26 June, 16:39
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    you will need to work out how many moles are in NH3, to get this you divide the mass by NH3's RMM (relative molecular formula) [14 + (3x1) = 17]

    5.00/17=0.294 moles

    so now that you've got the moles to get molecules you need to times the moles by avargado's constant 6.022x10^23

    the rule is that one mole of compound containes 6.022x10^23 molecules

    so now you times your moles of NH3 (0.294) by avargados constant

    0.294 x 6.002x10^23 = 1.765x10^23

    just to clarify thats 1.765 times ten to the power of 23
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