APFIVE Standard Enthalpy of Formation Comparison
How does the standard enthalpy of formation of a compound differ from that of an element in its standard state?
A
The standard enthalpy of formation of a compound is expressed in kJ/mol, while that of an element in its standard state is expressed in cal/g.
B
The standard enthalpy of formation of a compound is non-zero, while that of an element in its standard state is zero.
C
The standard enthalpy of formation of a compound is always positive, while that of an element in its standard state is always negative.
D
The standard enthalpy of formation of a compound is measured at 0°C, while that of an element in its standard state is measured at 25°C.
Question Leaderboard
| Rank | |||||
|---|---|---|---|---|---|
| #1 | lockdante2 | 2 | 2 | 1m 13s | 127 |
| #2 | minju.choi1 | 1 | 1 | 0m 00s | 100 |
| #3 | dvakharia | 1 | 1 | 0m 00s | 100 |
| #4 | Derinchiay2013 | 1 | 1 | 0m 25s | 75 |
| #5 | priyamk1122008 | 1 | 2 | 0m 36s | 54 |
| #6 | srinikasriyamathur | 1 | 1 | 1h 16m | -4,477 |
Items per page:
10
1 – 6 of 6