8. Thermochemistry
Thermochemical Equations
8. Thermochemistry
Thermochemical Equations
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- Multiple Choice
Nitromethane (CH3NO2), sometimes used as a fuel for drag racing, burns according to the following reaction:
4 CH3NO2 (l) + 7 O2 (g) → 4 CO2 (g) + 6 H2O (g) + 4 NO2 (g) ∆Hº = – 2441.6 kJ
How much heat is released by burning 125.0 g of nitromethane (MW:61.044 g/mol)?
6063views8rank - Multiple Choice
Consider the following reaction:
2 C6H6 (l) + 15 O2 (g) → 12 CO2 (g) + 6 H2O (g) ∆Hº = – 6278 kJ
What volume of benzene (C6H6, d = 0.880 g/mL, molar mass = 78.11 g/mol) is necessary to evolve 5.19 x 109 kJ of heat?
4302views5rank - Multiple ChoiceConsider two identical iron nails: One nail is heated to 95℃, the other is cooled to 15℃. The two nails are placed in a coffee cup calorimeter and the system is allowed to come to thermal equilibrium. What is the final temperature of the two nails?1043views
- Open Question
Which answer best describes the transfer of heat that occurs when 1.50 mol of H2 reacts?
1422views - Multiple ChoiceCalculate the standard enthalpy change (ΔH°_rxn) for the reaction: 2 Br₂(l) + C₂H₂(g) → C₂H₂Br₄(l) using the given bond energies.470views