1.

(A)The mass of one molecule of a substance is 4.65xx10^(-23)g. What is its molecular mass? What could be substance be? (b)Which have more molecules? 10g of sulphur dioxide (SO_(2)) or 10g of oxygen (O_(2))?

Answer»

Solution :(a) Mass of one molecules of substance =`4.65xx10^(-23g)`
`"Mass of "6.022xx10^(23)"molecules of substance"=6.022xx10^(23)xx(4.65xx10^(-23))=28g`
The substances can be carbon MONOXIDE (CO) with molecular mass=12+16=28u or 28g
(b) `"MOLAR mass of "SO_(2)=32h+2xx16g=64g`
`"64g of sulphur DIOXIDE represent molecules"=6.022xx10^(23)`
`"10g of sulphur dioxide represent molecules"=(6.022xx10^(23)xx(10g))/((64g))=9.40xx10^(22)`
`"Molar mass of oxygen "(O_(2))=32G `
32g of oxygen represent molecules =`6.022xx10^(23)`
`"10g of oxygen represent molecules"=(6.022xx10^(23)xx(10g))/((32g))=1.88xx10^(23)`


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