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at STP volume of gas 22.4 lit , here a unkonkn gas has volume 112 ml (0.112lit) , mole of gas= given volume/voulme at STP,. mole of gas =0.112/22.4, mole of gas= 0.005 , and another formula of mole of gas = weight/molar mass , 0.005= 0.22/ molar mass ,. molar mass= 0.22/0.005 , molar mass= 44 , means it is CO2 gas
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