Question

calculate the amount of magnesium oxide formed when 1.2 g of magnesium burns completely in oxygen​

Answer 1

Answer:

No.of moles of Mg =

given mass/atomic mass

1.2/24

=0.005

Now the balanced equation for the reaction is:

2Mg+O2--->2MgO

0.005 moles of magnesium will form 0.005 moles of magnesium oxide(MgO).

∴ mass of 0.005 moles of MgO

=0.005×40

= 0.2g