Please hear me out. I need help with my chemistry homework fast because my school is almost over and I don’t know what I can do. Please help me with my chemistry homework as soon as possible

Question

1.) For the reaction C + 2H2 → CH4, how many moles of hydrogen are needed to make 153.2 grams of methane, CH4 ?

Round your answer to the nearest tenth. If you answer is a whole number like 4, report the answer as 4.0

Use the following molar masses. If you do not use these masses, the computer will mark your answer incorrect.:

Element	Molar Mass
Hydrogen	1
Carbon	12

2.) S   + 6 HNO3 --> H2SO4 + 6 NO2 + 2 H2O

In the above equation how many moles of water can be made when 147.3 grams of HNO3 are consumed?

Round your answer to the nearest tenth. If you answer is a whole number like 4, report the answer as 4.0

Use the following molar masses. If you do not use these masses, the computer will mark your answer incorrect.:

Element	Molar Mass
Hydrogen	1
Nitrogen	14
Sulfur	32
Oxygen	16

please help me

Answer 1

HI Mandy,

1) our equation is C + 2H2 ---> CH4

2 mol H2 gives 1 mol of CH4

This means, from the given table of molar mass,

4 gm hydrogen gives 16 gm CH4

So, for 16 gm CH4 , 4 gm hydrogen is required.

Hence, for 153 .2 gm CH4, hydrogen needed will be,

(153.2×4)/16 = 38.3 gm hydrogen is needed.

2) As per given equation,

6 moles of HNO3 gives 2 moles of H2O

It means,

6×63=378 gm HNO3 gives 2 ×18 = 36 gm of H2O.

So,

147.3 gm HNO3 will give = (147.3)×(36)/378 = 14.03 gm H2O

Thus, convert 14.03 gm of H2O into moles

Moles of H2O = 14.03/18 = 0.8 mol