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30 g of magnesium and 30 g of oxygen are...

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

A

60 g of magnesium oxide only

B

40 g of magnesium oxide and 20 g of oxygen

C

45 g of magnesium oxide and 15 g of oxygen

D

50 g of magnesium oxide and 10 g of oxygen.

Text Solution

Verified by Experts

The correct Answer is:
D
`underset(2 mol ) ( 2Mg) + underset(1 mol ) (O_2) to underset(2 mol) ( 2MgO)`
30 g of Mg `=(30)/(24) = 1.25 mol `and 30 g of `O_2 =(30)/(32) = 0.9375 ` mol
1.25 mol of Mg will react with `(1.25 )/(2 ) = 0.625` mole of oxygen Thus magnesium is the limiting reagent and will be consumed completely.
Remaining oxygen = 0.9375 -0.625 = 0.3125 mol = 0.3125 `xx` 32 = 10 g
MgO formed = 1.25 mol `-=` 1.25 `xx` 40 = 50 g
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