Question

2.4 g of Mgis burnt with excess of O2, MgO produced would be​

Answer 1

Answer:

As there is 60.30% of magnessium in MgO.

So, let the mass of MgO be x

60.30% of x = 2.4

x = 2.4*100/60.30

x = 3.98g

Therefore, MgO produced would be 3.98 regardless of excessive of O2 as they would combine in a definite ratio.

Answer 2

Atomic mass of magnesium=24g

Atomic mass of oxygen=16g

chemical equation is:

2Mg + O2 gives 2MgO

2×24 +16×2 gives 2[24+16]

48+32 gives 2×40

80 = 80

Mg. MgO

48g 80

2.4g. x

Cross multiply

x=80×2.4/48

x=4g

Therefore, MgO produced would be 4g.