Question

5 mole of o2 combine with mg to form ngo the mass of mg that has combined is

Answer 1

The reaction that takes place is:

O2 + Mg ---> 2MgO

so for 5 moles of O2 to react completely it must react with 10 moles of Mg.

we know that:

no. of moles = given mass / molar mass

10 = x/24

x = 240g

Answer: 240g of Mg reacts with 5 moles of O2