Please help me I don't understand this stuff

Question

3 Cu  +   8HNO₃  --> 3 Cu(NO₃)₂   +  2 NO  +  4  H₂O

In the above equation how many moles of water can be made when 191.8 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
Copper	63.5
Oxygen	16

Answer 1

1. In the given reaction, the stoichiometry shows that 8 moles of HNO₃ produces 4 moles of H₂O.

2. Determine the number of moles in 191.8 g of HNO₃ using the molar mass values in the table:

molar mass HNO₃ = 1 + 14 + (3)(16) = 63 g HNO₃ / mole HNO₃

∴ moles of HNO₃ = (191.8 g HNO₃ ) / (63 g HNO₃ / mole HNO₃) ≈ 3 moles HNO₃

3. Apply the relationship from step 1 and the answer to step 2 to determine the moles of H₂O:

8 moles HNO₃ / 4 moles H₂O = 3 moles HNO₃ / M moles H₂O

∴ M = 12/8 = 1.5