Recent content by chemister

How would you calculate the standard enthalpy of formation of N2O5(g) in kJ/mol from the following data (all species are gases): 2 NO + O2-----2 NO2 ∆H° = –114.1 kJ 4 NO2 + O2-----2 N2O5 ∆H° = –110.2 kJ N2 + O2------2 NO ∆H° = +180.5 kJ Any help is greatly appreciated!

Why and how does ice sublimate in the freezer?

How would you calculate the heat of vaporization of titanium (IV) chloride using the following data: Ti (s) + 2Cl2 (g)-----TiCl4 (l) Standard Molar Enthalpy of formation= -804.2 KJ/mole Ti (s) + 2Cl2 (g)-----TiCl4 (g) Standard Molar Enthalpy of formation= -763.2 KJ/mole Is it...

For this problem I just used 0.0821, but usually I use 0.082057

Thanks for your help. So if i have done things right my answer should be close to 2.39 X 10^5 L :smile:

When converting 19.7 Kg to moles would you use H2 (being 2.0158g) or just H (being 1.0079g)?

Which balloon reaction is going to result in the largest increase in entropy of the surroundings and why? Does the H2 filled balloon give off a higher heat content than the H2/O2 balloon?

Do you have to take into account the hydrogen beginning as a LIQUID and ending as a GAS?

If 277 L of LIQUID hydrogen has a mass of 19.7 kg, what volume will this amount of hydrogen occupy as a GAS at 25 degrees celcius and 1 atm? Is there some kind of equation that I can use to make this problem easier? THANKS!

If you were to explode two different balloons, one filled with H2 gas and another filled with a mixture of H2 and O2 gasses in a 2:1 volume ratio, which balloon would have a much larger fireball associated with it and why? Also, why is it necessary to start the reaction with a flame...

What Do The Different Variables Stand For In The Equation?

Please Help! I am pretty confused about this problem. Can anyone offer some suggestions? Pretty please. :smile: All of the gas inside of a flask is removed and the flask is found to weigh 123.17g. It is filled with a gas of unknown molar mass until the pressure inside the flask is 658...

There are about 0.0626 moles of Fe_{2}O_{3} in 10.0g

Please Help! I am still having problems with this problem... It deals with the thermite reaction Fe_{2}O_{3}+2Al----2Fe+Al_{2}O_{3} If 1 mole of Al is reacted with 10.0g of Fe_{2}O_{3}, how many grams of unreacted Al would remain?

Huh? I don't understand?