Question

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Answer 1

Hi !

hope it will help u!!!

a)

Given mass = 12 g

Molar mass of oxygen gas ( O₂) = 2 x 16 = 32 g

No: of moles = given mass / molar mass

                     = 12/32 = 0.375 moles

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b) 

Given mass = 20 g

Molar mass of water (H₂O) = 2 x 1 + 16 = 18 g

No: of moles = given mass / molar mass

                    = 20/18 = 1.11 moles

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c) 

Given mass = 22 g

Molar mass of carbon dioxide (CO₂) = 12 + 2 x 16 = 44 g

No: of moles = given mass / molar mass

                    = 22/44 = 0.5 moles

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Answer 2

no of moles =given mass/molar mass . So 12/16= 3/4

Similarly water =2ho or h2o. 2hydrogen +oxygen=2*1+16=18.

18/20=9/10.

carbondioxide =co2= 12+16*2=42.

22/42=1/2.