1.

1 g Mg was burnt in a closed vessel containing 2 g oxygen. Which of the following are not correct?

Answer»

0.25 G of Mg will be left unburnt
1.33 of `O_(2)` will be left unreacted
2.5 g of MgO will be formed
The mixture at the end will weigh 3 g.

Solution :`{:(2Mg,+,O_(2),rarr,2MgO),(2xx24g,,32g,,2xx40),(=48G,,,,=80g):}`
`"48 g Mg react with "O_(2)=32 g`
`therefore"1 g Mg will react with "O_(2)=(32)/(48)g=0.67g.`
Thus, whole of Mg will react
`O_(2)" left unreacted "=2-0.67=1.33g`
`MgO" formed"=(80)/(48)g=1.67g.`
Total `=1.67+1.33=3.0g`
Also, by law of conservation of mass, mixture at the end should weigh `1g+2g=3g`


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