Hi please help me with my homework as soon as possible please I have received no help whatsoever and I am so stressed please help me pleadr

Question

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

In the above equation, how many grams of water can be made when 13.5 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

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

please help by explaining and solving please

Answer 1

For every 2 moles of HNO3 1 mole of water is produced

So 1 mole of HNO3 - 0.5 moles water

13.5 moles of HNO3, 13 X 0.5 = 6.5 moles of water

Water has molecular mass 1x2 + 16 = 18

So grams of water = 18 x 6.5 = 117 g