hello please respond I desperately need help with my chemistry homework as soon as possible please

Question

1.) For the reaction C + 2H2 → CH4, how many grams of hydrogen are required to produce 17 moles 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.) 3 Cu + 8HNO3 → 3 Cu(NO3)2   + 2 NO + 4 H2O

In the above equation, how many grams of water can be made when 1.4 moles 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

please help me by explaining and solving please

Answer 1

Convert from moles of one compound to moles of the other via coefficients of balanced reaction, then multiply by molar mass.

1) (17 mol CH₄) * (2 mol H₂ /1 mol CH₄) * (2 g H₂ /1 mol H₂) = 68.0 g H₂.

2) (1.4 mol HNO₃) * (4 mol H₂O /8 mol HNO₃) * (18 g H₂O /1 mol H₂O) = 12.6 g H₂O.