1.

30g of magnesium and 30g of oxygen are reacted and the residual mixture contains

Answer»

45 g of magnesium OXIDE and 15G of OXYGEN
50g of magnesium oxide and 10g of oxygen
60g of magnesium oxide only
40g of magnesium oxide and 20g of oxygen

Solution :30 gram of Mg and 30 gram of `O_(2)` are reacted.
`2Mg+O_(2)=2MgO`
`2xx24` gram of magnesium combines with 32 gram of oxygen.
`therefore`30 gram of magnesium combines with
`(32xx30)/(2xx24)` gram of `O_(2)=20` gram of `O_(2)`.
Residual mixture contains (30-20) gram=10 gram
of `O_(2) and 50` gram of magnesium oxide.


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