Calculate the standard enthalpy of formation of liquid water
(H2O) using the following thermochemical
information:
2 HNO3(l) N2O5(g) + H2O(l) | H = +92.0 kJ | |
2 N2(g) + 5 O2(g) 2 N2O5(g) | H = +59.3 kJ | |
N2(g) + 3 O2(g) + H2(g) 2 HNO3(l) | H = -348.2 kJ |
The formation reaction is:
H2(g) + 1/2 O2(g) -> H2O(l)
Let this be reaction 0
Lets number the reaction as 0, 1, 2, 3 from top to bottom
required reaction should be written in terms of other
reaction
This is Hess Law
required reaction can be written as:
reaction 0 = +1 * (reaction 1) -0.5 * (reaction 2) +1 * (reaction
3)
So, ΔHo rxn for required reaction will be:
ΔHo rxn = +1 * ΔHo rxn(reaction 1) -0.5 * ΔHo rxn(reaction 2) +1 *
ΔHo rxn(reaction 3)
= +1 * (92.0) -0.5 * (59.3) +1 * (-348.2)
= -285.85 KJ
Answer: -285.85 KJ
Calculate the standard enthalpy of formation of liquid water (H2O) using the following thermochemical information: 2...
15. # -/0.1 points 0/4 Submissions Used Calculate the standard enthalpy of formation of liquid water (H2O) using the following thermochemical information: N205(9) + H2O(1) = 2 HNO3(0) 2 N205(g) = 2 N2(g) + 5 O2(g) N2(g) + 3 O2(g) + H2(g) = 2 HNO3(1) AH = -92.0 kj AH = -59.3 kj AH = -348.2 kJ AH = kJ
Calculate the standard enthalpy of formation of liquid water (H2O) using the following thermochemical information: 2 B2O3(s) 4 B(s) + 3 O2(g) H = +2509.1 kJ B2O3(s) + 3 H2O(l) B2H6(g) + 3 O2(g) H = +2147.5 kJ 2 B(s) + 3 H2(g) B2H6(g) H = +35.4 kJ H = ______ kJ
Calculate the standard enthalpy of formation of liquid water (H2O) using the following thermochemical information: CH4(g) C(s) + 2 H2(g) H = +74.8 kJ CO2(g) C(s) + O2(g) H = +393.5 kJ CO2(g) + 2 H2O(l) CH4(g) + 2 O2(g) H = +890.4 kJ
Calculate the standard enthalpy of formation of gaseous acetylene (C2H2) using the following thermochemical information: 2 C2H2(g) + 5 O2(g) 4 CO2(g) + 2 H2O(l) H = -2599.3 kJ CO2(g) C(s) + O2(g) H = +393.5 kJ 2 H2O(l) 2 H2(g) + O2(g) H = +571.7 kJ H = kJ
Calculate the standard enthalpy of formation of gaseous methane (CH4) using the following thermochemical information: CO2(g) + 2 H2O(l) CH4(g) + 2 O2(g) H = +890.4 kJ CO2(g) C(s) + O2(g) H = +393.5 kJ 2 H2O(l) 2 H2(g) + O2(g) H = +571.7 kJ
Calculate the standard enthalpy of formation of gaseous carbon dioxide (CO2) using the following thermochemical information: 2 C(s) + H2(g) C2H2(g) H = +226.8 kJ 2 C2H2(g) + 5 O2(g) 4 CO2(g) + 2 H2O(l) H = -2599.3 kJ 2 H2O(l) 2 H2(g) + O2(g) H = +571.7 kJ H = _______kJ
Consider the following data. 2 H2(g) + O2(g) 2 H2O(l) ΔH = -571.7 kJ N2O5(g) + H2O(l) 2 HNO3(l) ΔH = -92.0 kJ N2(g) + 3 O2(g) + H2(g) 2 HNO3O(l) ΔH = -348.2 kJ Use Hess's law to calculate ΔH for the reaction below. 2 N2O5(g) 2 N2(g) + 5 O2(g) ΔH = _____kJ
Calculate the standard enthalpy of formation of gaseous carbon tetrafluoride (CF4) using the following thermochemical information: 2 HF(g) H2(g) + F2(g) H = +537 kJ 2 CF4(g) + 4 HF(g) C2H4(g) + 6 F2(g) H = +2486.3 kJ C2H4(g) 2 C(s) + 2 H2(g) H = -52.3 kJ Calculate the standard enthalpy of formation of gaseous carbon tetrafluoride (CF4) using the following thermochemical information: 2 HF(g) H2(g) + F2(g) H = +537 kJ 2 CF4(g) + 4 HF(g) C2H4(g) +...
15. + -10.1 points 0/4 Submissions Used Calculate the standard enthalpy of formation of gaseous nitrogen monoxide (NO) using the following thermochemical information: N2(g) + 3 H2(g) = 2 NH3(9) 4 NO(g) + 6 H2O(l) = 4 NH3(g) + 5 O2(9) 2 H2O(1) = 2 H2(g) + O2(9) AH = -92.4 kJ AH = +1167.1 kJ AH = +571.7 kJ AH =
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