Question

6.3g of concentrated nitric acid is diluted by adding 68g of pure water. How many oxygen molecules are present in the solution?

Answer 1

Answer:

HNO3, water in the HNO3 solution

(it is concentrated HNO3, so it is 15.8M...

which means it has water, too), and the Water you add after. Number of O atoms:

4.091 mole × ( 6.02×10^23 atoms 1  mol)

= 2.46×1024 Oxygen  atoms.