3 Cu + 8HNO3 --> 3 Cu(NO3)2 + 2 NO + 4 H2O In the above equation how many grams of water can be made when 9 grams of HNO3 are consumed?

Question

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

Step 1: Calculate no. of moles of HNO₃. (No of moles = weight of HNO₃/Molar mass of HNO₃)

Answer: Molar mass of HNO₃ = 63. So no of moles of HNO₃ = 9/63 = 0.143.

Step 2: From the chemical equation given, 8 molecules of HNO₃ can give 4 molecules of H₂O. So 0.143 moles of HNO₃ can give

x = 0.143* (4/8)

= 0.0715 moles of H₂O

Step 3: Convert 0.0715 moles into grams

0.0715* 18 = 1.3 g of H₂O

Final answer is 1.3 g of H₂O