How many grams of nitric acid are needed to produce 30.0 g of water?

Question

4Zn+10HNO3–>4Zn(NO3)2+ NH4NO3+3H2O

partial answer: 3XX. g HNO3

Answer 1

Similar to other questions you've asked. Here is an outline. You should be able to do these yourself.

4Zn + 10HNO₃ ==> 4Zn(NO₃)₂ + NH₄NO₃ + 3H₂O ... balanced equation

you want to make 30.0 g of H2O and are asked how much HNO3 you need. NOTE the mole ratio of HNO3 to H2O. It takes 10 moles HNO3 to make 3 moles H2O.

Using dimensional analysis and the stoichiometry of the balanced reaction, you have...

30.0 g H2O x 1 mol/18 g x 10 mol HNO3/3 mol H2O x 63.0 g/mol = grams HNO3 needed