Question 1
The heat of combustion per mole for acetylene, C
2H
2(
g), is -1299.5 kJ/mol. Assuming that the combustion products are CO
2(
g) and H
2O(
l), and given that the enthalpy of formation is -393.5 kJ/mol for CO
2(
g) and -285.8 kJ/mol for H
2O(
l), find the enthalpy of formation of C
2H
2(
g).
◦ -226.7 kJ/mol
◦ -846.1 kJ/mol
◦ -620.2 kJ/mol
◦ +226.7 kJ/mol
Question 2
Which of CH
4(
g), C
2H
2(
g), and CH
3OH(
l) provides the most energy per gram upon combustion and which provides the least?
| CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(l) | ΔH° = -890 kJ |
| 2 C2H2(g) + 5 O2(g) → 4 CO2(g) + 2 H2O(l) | ΔH° = -2599 kJ |
| 2 CH3OH(l) + 3 O2(g) → 2 CO2(g) + 4 H2O(l) | ΔH° = -1453 kJ |
◦ C
2H
2 provides the most energy per gram and CH
3OH the least.
◦ CH
4 provides the most energy per gram and C
2H
2 the least.
◦ CH
4 provides the most energy per gram and CH
3OH the least.
◦ C
2H
2 provides the most energy per gram and CH
4 the least.
Absorption of light energy by an electron
Gram Negative Testing
Gram negative N. gonorrhoeae.
Combustion chamber volume is the volume above the piston with the piston at top dead center.
Absorption spectra and light energy
Energy and Energy Units