1.

Calculate thevolume occupied by200 g of SO_(3) gas at STP and the number ofmolecules present in it.

Answer»

Solution :Weight of `SO_(3)` taken = 200 G
Number of moles of `SO_(3) = 200/("GMW of "SO_(3))=200/80 = 2.5 ` moles
Volume occupied by 1 mole of gas is22.4 L, at STP
Volume occupied by thegiven AMOUNT of gas = `2.5 xx 22.4 = 56` L
Number of molecules PRESENT in 1mole of gas= ` 6.023 xx 10^(23)`
Number of molecules present in thegiven amount of gas= `2.5 xx 6.023 xx 10^(23) = 15.05 xx 10^(23)` molecules


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