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 187.1 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

• 8 moles of HNO3 gives 4moles water
• 1mol of HNO3 gives 0.5mol of water

Moles of HNO_3

`\\ \rm\hookrightarrow Given\:mass/Molar\:mass`

`\\ \rm\hookrightarrow 18.71/63.01=0.29mol`

Moles of water:-

• 0.29(0.5)=0.145mol=0.1mol