Physical Chemistry Answers

balanced chemical equation for the following.
1. sodium hydroxide solution is treated with acidic acid to form sodium hydrogen carbonate.

write the chemical equations for the following and identify the reaction.
1. Nitrogen gas is treated with hydrogen gas in the presence of catalyst at 773k to form ammonia gas.

I have a sheet on Hess's Law where Enthalpy change is sometimes given as kJ and other times kJ/mol.
Why? What's the difference?

The latter is given as "The heat of vaporisation of water is 44kJ/mol. Calculate the heat of reaction [gaseous ethanol]..."
Why is it kJ/mol and should the heat of reaction be given as kJ or kJ/mol?

Sulfur forms two compounds with fluorine. In one of them 0.447g of sulfur is combined with 1.06g of fluorine and in the other 0.438g sulfur is combined with 1.56g of fluorine. Prove that these data illustrate the Law Of Multiple Porportions?

A 1.6 g samlpe of metal that appears to be gold required 5.8 j of energy to make an 18 degrees celcius temerature change. is the metal pure gold?

what is the difference between evaporation & crystallization?

is it possible to go 335,000,000 mph? (or half the speed of light)

What mass of Oxygen gas would occupy a volume of 1800mL at Standard conditions? Atomic weight of oxygen is 16.

what is the equation of Cu2S + O2 = Cu2O + SO2 after it has been balanced

Which kind of energy is stored within a chemical substance