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a)12g of oxygen gas
given mass=12
molar mass of oxygen gas(O2)=2×16=32g
no.of mole= given mass /molar mass
=12/32 =0.375moles
b)20g of water
given mass=20
molar mass of water(H2O)=2×1+16=18g
no.of mole=given mass /molar mass
=20/18=1.11mole
c)22g of carbon dioxide
given mass=22
molar mass of water(CO2)=12+2×16=44g
no.of mole=given mass /molar mass
=22/44=0.5mole
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