Help me please please someone as soon as possible please

Question

1.) 3 Cu + 8HNO3 → 3 Cu(NO3)2  + 2 NO + 4 H2O

In the above equation, how many grams of water can be made when 4.3 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

2.) S  + 6 HNO3 → H2SO4 + 6 NO2 + 2 H2O

In the above equation, how many grams of water can be made when 7.4 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

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

Sulfur       32

Oxygen   16

please please just solve and explain

Answer 1

If 4.3 mol HNO₃ are consumed you can use the mole ratio to see how many mole of water is produced. From the balanced equation you have the mole ratio of 8 mol HNO₃ : 4 mol H₂O. Then convert mol water to mass in grams of water.

4.3 mol HNO₃ x 4 mol H₂O/8 mol HNO₃ = 2.15 mol H₂O

Remember 1 mol H₂O has a mass of 18.0 g (H+H+O = 1+1+16)

So 2.15 mol has a mass of 2.15 mol x 18.0g/mol = 38.7 g of water will be produced

Question 2 is the same type of question, but using a different mole ratio. 6 mol of HNO₃ : 2 mol H₂O