Evaluate Delta H (standard) for the reaction below at 25 degress celcius
SiO2 (s) + 4HF (aq) >>>>>>> SiF4 (g) + 2H2O (l)
Delta H standard f (kj/mol) -910.9 -320.8 -1615 -285.8© BrainMass Inc. brainmass.com October 24, 2018, 6:21 pm ad1c9bdddf
The solution sets-up the evaluation.
At one time, a common means of forming small quanities of oxygen gas in the laboratory was to heat KCLO3: 2KCLO2(s) --> 2KCL + 3O2 Delta H=-89.4KJ
At one time, a common means of forming small quanities of oxygen gas in the laboratory was to heat KCLO3:
2KCLO2(s) --> 2KCL + 3O2 Delta H=-89.4KJ
For this reaction, calculate the delta H for the formation of
a)0.855mol of o2
b) 10.75 g of KCL
c) The decomposition of KClo3 proceeds spontaneously when it is heated. DO you think that the reverse reaction, the formation of KCLO3 from KCL and O2, is likely to be feasible under ordinary condtions? Explain your answer
Under constant-volume conditons teh head of combustion of benzoic acid (HC7H5O2) is 26.38Kj.g. A 1.640g sample of benzoic acid is burned in a bomb calorimeter. The temperature of the calorimeter increases from 22.25 celcius to 27.20celcius.
a) What is the total heat capacity of the calorimeter?
b) A 1.320g sample of a new organic substance is combusted in the same calorimeter. The temperature of the calorimeter increased from 22.14 celcius to 26.82 degrees celcius. What is the heat of combustion per gram of the new substance
c) Supose that in changing sample, a portion of the water in the calorimeter were lost, In what way, if any, would this change the heat capacity of the calorimeter
From the enthalpies of the reaction
2H2 + O2--> 2H20 H= -483.6kj
Calculate the heat of the reaction
3H2 + O3-->3H20
Calcium Carbide (CaC2) reacts with water to form acetylene (C2H2) and Ca(OH)2. From the following enthalpy of reaction data and data in Appendix C, calculated H formation of CaC2
CaC2+2H20-->(Ca(OH2)2 +C2H2 delta H=-127.2Kj