4 NH3+ 7O2 --> 4NO2+6H2O How many grams of O2 are needed to produce 1.26 x 1028 molecules of H2O?
no idea how to do this, really need to get it done :(

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.

When a scientific theory has been tested and proved by the scientific community, it becomes a law

Which is true of a liquid? it has a definite volume but not a definite mass.it has a definite mass but not a definite volume.it has a definite volume but not a definite shape.it has a definite shape but not a definite volume.