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30 November, 14:05

Q1. Calculate the number of moles of each substance in samples with the following masses:

a) 2.4 g of He

b) 250 mg of Carbon

c) 15 g of sodium Chloride

d) 40 g of Sulphur

Q2. Calculate the mass in grams of each of the following samples:

a) 1.2 moles of K

b) 75 moles of H2

c) o. 25 moles of steam

d) 0.15 mole of Cuso4

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Answers (1)
  1. 30 November, 15:58
    0
    1) a) 2.4/4=0.6

    b) 250x10^ (-3) / 12=1/48g

    c) 15/58.5=10/39

    d) 40/256.8=50/321g

    a) 1.2x39.1=46.92g

    b) 75x2=150g

    c) 0.25x18=4.5

    d) 0.15x159.6=23.94g
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