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28/12/2020 3:24 pm
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Convert into mole.
(a) 12 g of oxygen gas
(b) 20 g of water
(c) 22 g of carbon dioxide
1 Answer
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28/12/2020 3:31 pm
(a) Molar mass of O2
= 2 x 16 = 32 g
∴ Number of moles in 12 g of O2
= Given mass/Molar mass = 12/32 = 0.375 mole
(b) Molar mass of H2O
= 2 x 1 + 16 = 18 g
∴ Number of moles in 20 g of H2O
= 20/18 = 1.11 mole
(c) Molar mass of CO2
= 12 + 2 x 16
= 12 + 32 = 44 g
∴ Number of moles in 22 g of CO2
= 22/44 = 0.5 mole