Question

1.0g of magnesium is burnt with 0.56g O2(oxygen) in a closed vessel . Which reactant is left in excess and how much ? (At. wt. Mg = 24 ; O = 16)

Answer 1

2Mg+O2-------> 2MgO
here we look 32 g of O2 is react with 48g of Mg

so ,1 g of O2 is react with 48/32g=3/2g of Mg

so, 0.56 g of O2 is react with 0.84g of Mg

hence Mg is that reagent which is excess and (1-0.84)=0.16g excess

Answer 2

Answer:

Explanation:2Mg+O2-------> 2MgO

here we look 32 g of O2 is react with 48g of Mg

so ,1 g of O2 is react with 48/32g=3/2g of Mg

so, 0.56 g of O2 is react with 0.84g of Mg

hence Mg is that reagent which is excess and (1-0.84)=0.16g