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4 October, 02:38

Calculate the number of moles

41.0 g of Ca (NO3) 2

1.48 g of Ca (OH) 2

3.40 g of CaSO4

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Answers (1)
  1. 4 October, 02:53
    0
    First. moles is just a label for a number of things. just like a dozen = 12, a gross = 144, a mole = 6022 with another 20 zeros after the 2

    next

    moles = mass / molecular weight.

    molecular weight = sum of atomic mass from the periodic table

    atomic mass MnO2 = atomic mass Mn + 2 x atomic mass O

    = 54.94 + 2 x 16 = 86.94 g/mole

    so moles MnO2 = 98.0 grams / (86.94 g/mole) = 1.13 moles

    notice that I only gave 3 digits? that because of sig figs read the link below if you don't understand ...

    mw C5H12 = 5 x 12 + 12 x 1 = 72 g/mole

    so moles C5H12 = 12.0 g / 72.0 g/mole = 0.167 moles

    mw XeF6 = 131.3 + 6 x 19.00 = 245.3

    so moles XeF6 = 100 g / 245.3 g/mole = 0.4077 moles

    I've also provided a link to a periodic table. if you need atomic weights click on any element and it will give you the

    details.
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