Question

the molar mass off O2 is 32.0 g/mol. what mass in tye grams of 02 is Required to react completely with 4.00 mol mg

Answer 1

64.0 grams!

Step-by-step explanation:

Use the mole ratios

Answer 2

The balanced reaction is:

2Mg + O2 = 2MgO

We are given the amount of magnesium to be reacted with O2. This will be the starting point of the calculations.

4.00 g C3H8 ( 1 mol Mg/ 24.31 g Mg ) ( 1 mol O2 / 2 mol Mg ) ( 32.0 g O2 / 1 mol O2 ) = 2.63 g O2