Find the number of moles: (a) 12g of Oxygen Gas (b) 20g of Water (c) 22g of Carbon Dioxide —————————————————————
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Given :
▪ Mass of oxygen gas = 12g
▪ Mass of water = 20g
▪ Mass of carbon dioxide = 22g
To Find :
➳ Number of moles of each compound
Solution :
➝ No. of mole is defined as the ratio of mass of substance to the molar mass of substance
➝ It has no unit. (unitless quantity)
፨ Molar mass of = 32g/mol
፨ Molar mass of = 18g/mol
፨ Molar mass of = 22g/mol
Let's calculate ☃
(I) No. of moles of oxygen gas :
➢ n¹ = 12/32 = 0.375
(II) No. of moles of water :
➢ n² = 20/18 = 1.11
(III) No. of moles of carbon dioxide :
➢ n³ = 22/44 = 0.5
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