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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))`? |
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Answer» (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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