Enthalpy - Page 3
Questions
- Write the reaction which has a heat of reaction equal to heat of formation for HCl(g) ?
- Find ΔErxn for the reaction in kJ/mol hexane. The heat capacity of the bomb calorimeter, determined in a separate experiment is 5.79 kJ/∘C ?
- At #100^@ "C"# and #"1.00 atm"#, the molar volume of water vapor is #"30.6 L/mol"# and the enthalpy of vaporization is #"40.66 kJ/mol"#. What is the change in internal energy at this temperature for #"1 mol"# of water? (#rho("H"_2"O"(l)) ~~ "996 g/L"#)
- What is an enthalpy diagram?
- What do we mean by the 'enthalpy' of a chemical bond? How does it help us to know whether a reaction will be endothermic (take in heat energy from the environment) or exothermic (release heat energy to the environment)?
- Is the change in enthalpy positive or negative for an exothermic reaction?
- How would you use a standard enthalpies of formation table to determine the change in enthalpy for these reactions?
- How does enthalpy affect the spontaneity of a reaction?
- What is the difference between #"atomization energy"# and #"bond dissociation energy"#?
- What is the standard enthalpy of formation of SO2(g)?
- Consider the reaction 2 Al2O3(s) -> 2 Al(s) + 3 O2(g). The heat of formation of aluminum oxide is -1669.8 kJ/mol. Calculate the heat of reaction?
- How does entropy effect enthalpy?
- Why is enthalpy of formation negative?
- What mass of hydrogen is required to produce 10,000 kJ of energy?
- Ammonium nitrate + water = enthalpy?
- When a cook heats water to make pasta, energy flows _____ the pot of water, so DH is _____. A) into, 0 or B) into, > 0 ?
- When 2 moles of #H_2(g)# and 1 mole of #O_2(g)# react to give liquid water, 572 kJ of heat evolve. #2H_2(g)# + #O_2(g)# #rarr# #2H_2O(l)# ; #DeltaH# = -572 kJ a) What is the themochemical eq. for 1 mole of liquid water?
- How does pressure affect enthalpy?
- How do you determine the amount of heat (in kJ) given off when #1.26 xx 10^4# g of ammonia are produced according to the equation #N_2(g) + 3H_2(g) -> 2NH_3(g)#, #DeltaH°_(rxn)# = -92.6 kJ/mol?
- What is the standard enthalpy change of combustion of ethane?