Determine the overall energy change for the reaction between hydrogen and oxygen

Ineed this asap part i: scientific method what is the difference between science and pseudoscience? what is the scientific method?

Suppose that some of the compound spilled out of the crucible after it was heated. would that cause the percent by mass of water in the compound determined by the experiment to be too low, too high, or unchanged? briefly explain your answer.

What is the volume of 3.2 moles of chlorine gas (cl2) at 295 k and 1.1 atm?