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Solution given:

8.

4 hydrogen 1 oxygen

9.

4 hydrogen

2oxygen

Required reaction is:

2H2+O2➔2H2O

now

10.

oxygen have 16 amu than total mass in the left side of oxygen is:

16×2=32 amu of Oxygen

11.

total mass of Oxygen in product side is;

16×2=32 amu of Oxygen

i just calculated it all out, and not including weekends, and all the different days off. as of this school year (2018-2019) students are spending 2198 hours in school this year

i think that the answer is c