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1g of Mg is burnt in a closed vessel whi...

1g of Mg is burnt in a closed vessel which contains `0.5g of O_(2)`
(i) Which reactants is left in excess
(ii) Find the mass of the excess reactant.

A

`O_2` is a limiting reagent and Mg is in excess by 0.25 g.

B

Mg is a limiting reagent and is in excess by 0.5 g.

C

`O_2` is a limiting reagent and is in excess by 0.25 g.

D

`O_2` is a limiting reagent and Mg is in excess by 0.75 g.

Text Solution

Verified by Experts

`underset(2xx24)(2Mg)+underset(2xx16)(O_2) to underset(2(24+16))(2MgO)`
48g of Mg requires 32g of `O_2`
1 g of Mg requires `32/48` = 0.66g of `O_2`
Oxygen available = 0.5g
hence, `O_2` is limiting reagent.
32g of `O_2` reacts with 48 g of Mg
0.5 g of `O_2` will react with `48/32xx0.5=0.75g` of Mg
Exess of Mg = (1.0-0.75)=0.25g
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Knowledge Check

  • 1 g of Mg is burnt in a closed vessel containing 0.5 g of O_(2) . Which of the following statements is correct ?

    A
    `O_(2)` is the limiting reagent and Mg is in excess by 0.25 g
    B
    Mg is the limiting reagent and is in excess by 0.5 g
    C
    `O_(2)` is the limiting reagent and is in excess by 0.25 g
    D
    `O_(2)` is the limiting reagent and Mg is in excess by 0.75 g

  • 1.0 g of Mg is burnt with 0.28 g of O_2 in a closed vessel . Which reactant is left in excess and how much ?

    A
    Mg , 5.8 g
    B
    Mg , 0.58 g
    C
    `O_2 , 0.24` g
    D
    `O_2` , 2.4 g

  • 1g of Mg is burnt with 0.28g of O_(2) in a closed vessel. Which reactant is left in excess and how much?

    A
    Mg,5.8g
    B
    Mg,0.58g
    C
    `O_(2),0.24g`
    D
    `O_(2),2.4g`

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