2006-08-13 11:31:35 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
physandchemteach:
Which one of about 400?
2006-08-14 05:32:35 · update #1
Given that the transformation of atomic H into molecular H2 is spontaneous, most certainly the reaction is exotermal. So heat is emmited.
2006-08-13 12:37:02 · answer #1 · answered by andreicnx 3 · 1⤊ 0⤋
When 2 H+ ions bond together to form H2 gas, energy is given off because energy is released whenever a bond is formed. That is because molecules are in a more chemically stable state. And from the answer above by (C), the enthalpy is 435kJ.
The equation would be:
2H+ -> H2 + 435kJ
2006-08-16 06:05:29 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Well then bond enthalpy of a H-H bond is 435kJ per mole if that helps.
The energy released when two H atoms join to form one H2 molecule would be ridiculously small. That's why energies are given as a 'per mole' value.
It helps to understand the question before looking for the answer.
2006-08-13 18:41:08 · answer #3 · answered by Anonymous · 2⤊ 1⤋
You will need to look that information up in the appendix of your text.
2006-08-13 21:00:41 · answer #4 · answered by physandchemteach 7 · 0⤊ 1⤋
i don't understand ur question...
but if it's the decomposition of water it should be
2H2O->2H2+02
2006-08-13 18:38:36 · answer #5 · answered by ☆LiAn☆ 3 · 0⤊ 2⤋