Brenda D. answered 04/30/21
Math's a tool not a terror
Hi Don R
First check to make sure you have a balanced reaction
Once that is confirmed you should be able to set up a ratio based on the moles in your balanced equation
Your Equation says that
8HNO3, 8 moles of Nitric Acid makes 4H2O or 4 moles of Water so
4 moles Water/8 moles Nitric Acid = x moles of Water/13.5 moles of Nitric Acid
You could cross multiply to solve for x moles of water
When you calculate x moles of water you can use the molar masses you have listed to convert your moles of water into grams of water
You can also do the same by converting everything into grams first according the moles in your balanced equation, and the moles given, then your answer would be in grams. You will need to use your masses given to calculate the molecular weights, of Nitric Acid and Water.
I hope this helps and by the way if your equation above is balance, it appears mathematically that the ratio of Nitric Acid to Water is 8 to 4 and 8/4 is 2 so the ratio of Nitric Acid to Water is 2 to 1.