Open Question
Which answer best describes the transfer of heat that occurs when 1.70 mol of H2 reacts?
8. Thermochemistry
Enthalpy of Formation
Back8. Thermochemistry
Enthalpy of Formation
- Open Question
Which answer best describes the transfer of heat that occurs when 1.40 mol of H2 reacts?
- Open Question
Given the following at 25°C, calculate ΔHf for HCN(g) (in kJ/mol) at 25°C.
- Open Question
In many ways, hydrogen as a biofuel compares very favorably to ethanol and other fuels.
- Open Question
Which answer best describes the transfer of heat that occurs when 1.30 mol of H2 reacts?
- Open Question
4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O(g)
- Open Question
What is the change in enthalpy associated with the combustion of 530 g of methane (CH4)?
- Open Question
The enthalpy of the reaction is –2,840 kJ. What is the heat of combustion, per mole, of glucose?
- Multiple ChoiceGiven the reaction 2C6H6(l) + 15O2(g) → 12CO2(g) + 6H2O(l), what is the standard enthalpy change (ΔH°) of this reaction in kJ?
- Multiple ChoiceA 0.1326 g sample of magnesium was burned in an oxygen bomb calorimeter. The total heat capacity of the calorimeter plus water was 5,760 J/°C. If the temperature rise of the calorimeter with water was 0.570°C, calculate the enthalpy of combustion of magnesium in kJ/mol.
- Multiple ChoiceWhat is the enthalpy change (ΔH) for the dissolution of 1 mole of substance X in water, given that the temperature of the solution increases from 12.0 °C to 30.0 °C when 1.40 g of X is dissolved in 35.0 mL of water? Assume the specific heat capacity of water is 4.18 J/g°C and the density of water is 1.00 g/mL.
- Multiple ChoiceWhich of the following expressions correctly calculates the change in enthalpy (ΔH) for a reaction using standard heats of formation?
- Multiple ChoiceWhich of the following statements is true regarding the enthalpy change of a reaction when the quantities of reactants are doubled?
- Multiple ChoiceCalculate the enthalpy change for the reaction: NO(g) + O(g) -> NO2(g), given the following standard enthalpies of formation: ΔHf°[NO(g)] = 90.25 kJ/mol, ΔHf°[O(g)] = 249.17 kJ/mol, ΔHf°[NO2(g)] = 33.18 kJ/mol.
- Multiple ChoiceCalculate the standard enthalpy change for the following reaction at 25°C using the standard enthalpies of formation: C3H8 (g) + 5O2 (g) -> 3CO2 (g) + 4H2O (g). Given: ΔHf° [C3H8 (g)] = -104.7 kJ/mol, ΔHf° [CO2 (g)] = -393.5 kJ/mol, ΔHf° [H2O (g)] = -241.8 kJ/mol.