Question

30 g of Magnesium and 30 g of Oxygen are reacted,
then the residual mixture contains

Answer 1

2Mg + O2 -> 2MgO

Step-by-step explanation:

According to the above reaction ,

28.6g(2mole) Mg combine with 32g (1mole) of O2 to give 80.6g (2 mole) of MgO.

thus,

30g Mg will combine with 20g of O2 to produce 50g MgO and 10gO2 will remain unreactive.

I hope it's helpful!