Chemistry?
2020-04-24 11:32 am
Which of the following enthalpies of reaction are identical to enthalpies of formation:
回答 (2)
2020-04-24 12:36 pm
Enthalpy of formation is defined as the enthalpy change in the standard state when one mole of the substance is formed from its elements in their standard states.
a. True
b. False
Two substances are formed, but not one substance.
c. False
Two moles of product are formed, but not one mole.
d. False
Two substances are formed, but not one substance.
The answer: a. ½N₂(g) + ½O₂(g) → NO(g) ΔHrxn = 90.3 kJ
a. True
b. False
Two substances are formed, but not one substance.
c. False
Two moles of product are formed, but not one mole.
d. False
Two substances are formed, but not one substance.
The answer: a. ½N₂(g) + ½O₂(g) → NO(g) ΔHrxn = 90.3 kJ
2020-04-24 11:38 am
a. is certainly an enthalpy of formation.
c. could be an enthalpy of formation if everything was divided by 2 -- I don't know if that counts or not.
b. and d. are certainly not enthalpies of formation.
c. could be an enthalpy of formation if everything was divided by 2 -- I don't know if that counts or not.
b. and d. are certainly not enthalpies of formation.
收錄日期: 2021-04-18 18:28:49
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20200424033203AA9h7Jm