How many grams of MgO are produced when 40.0g of O2 react with Mg?

Question

a. 30.4 g b. 50.4 c. 60.8 g d. 101g e. 201g

Answer 1

r u sure it is 40g not 40 dm cube.there is no answer.nearest is 100gm.

Answer 2

First you need a balanced equation

2Mg + O2 == 2MgO

Convert the 40.0 g of Oxygen to moles by dividing by the molecular mass of 32 g / mole

Now use the molar ratio of 2:1 to get the moles of MgO produced.

Finally, multiply that by the molecular mass of MgO to get grams