Question

convert into mole

(1) 12g of oxygen gas

(2) 108g of aluminium​

Answer 1

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Answer:-

(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

Answer 2

a) 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 Al=27g

number of moles in 108g Al=108/27=4mole

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