Question

convert into mole?
a. 12g of O2 gas
b. 20g of water
c. 22g of carbon dioxide

Answer 1

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(a) Molar mass of O2 = 2 x 16 = 32 g
= Number of moles in 12g O2 = Given mass/ Molar mass = 12/32 = 0.375 mole



(b) Molar mass of H2O = 2 x 1 + 16 = 18g
= Number of moles in 20 g H2O = 20/18 = 1.11mole



(c) Molar mass of CO2 = 12 + 16 x 2 = 12 + 32 = 44g
= Number of moles in 22g CO2 = 22/44 = 0.5mole








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Answer 2

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