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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 please help by explaining and solving please

Answer 1

(1) from the equation you need 2 moles of H₂ per mole of methane produced

so for 17 moles of methane you need 2 x 17 = 34 moles of H₂

Molecular mass of H₂ = 2 x atomic mass of H = 2 x 1 = 2g from the table

So mass of H₂ needed = 2 x 34 = 68g

(2) Find the moles of HNO₃ (1.4 / molecular mass)

Divide by 2 to get the moles of water

Find the molecular mass of water

Multiply by the number of moles of water