Question

19. Identify the equation that correctly represents the enthalpy of formation (?H°f) of water. (A) 2 H2(g) + O2(g) ? 2 H2O(g) ?H°f = - 241.8 kJ (B) 2 H2(g) + O2(g) ? 2 H2O(l) ?H°f = - 285.8 kJ (C) 4 H2(g) + 2 O2(g) ? 4 H2O(l) ?H°f = - 285.8 kJ (D) H2(g) + 1/2 O2(g) ? H2O(g) ?H°f = - 241.8 kJ 

          19. Identify the equation that correctly represents the enthalpy of formation (?H°f) of water.
(A) 2 H2(g) + O2(g) ? 2 H2O(g)  ?H°f = - 241.8 kJ
(B) 2 H2(g) + O2(g) ? 2 H2O(l)  ?H°f = - 285.8 kJ
(C) 4 H2(g) + 2 O2(g) ? 4 H2O(l)  ?H°f = - 285.8 kJ
(D) H2(g) + 1/2 O2(g) ? H2O(g)  ?H°f = - 241.8 kJ
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19. Identify the equation that correctly represents the enthalpy of formation (?H°f) of water. (A) 2 H2(g) + O2(g) ? 2 H2O(g) ?H°f = - 241.8 kJ (B) 2 H2(g) + O2(g) ? 2 H2O(l) ?H°f = - 285.8 kJ (C) 4 H2(g) + 2 O2(g) ? 4 H2O(l) ?H°f = - 285.8 kJ (D) H2(g) + 1/2 O2(g) ? H2O(g) ?H°f = - 241.8 kJ

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Chemistry: Structure and Properties
Chemistry: Structure and Properties
Nivaldo Tro 2nd Edition
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Identify the equation that correctly represents the enthalpy of formation (Hf) of water. (A) 2 H2(g) + O2(g) -> 2 H2O(g) ΔHf = -241.8 kJ (B) 2 H2(g) + O2(g) -> 2 H2O(l) ΔHf = -285.8 kJ (C) 2 H2(g) + O2(g) -> H2O(g) ΔHf = -285.8 kJ (D) H2(g) + 1/2 O2(g) -> H2O(g) ΔHf = -241.8 kJ
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Transcript

-
00:01 Hello everyone let's look at the question.
00:03 So here we are asked to write the balanced of thermochemical equation including the heat terms.
00:10 Okay now here the first one is water so the enthalpy of formation of water is given and we have to write the thermochembalance the thermochemical equation so here so water is formed by we know that h2 plus o2 giving water molecule okay so here if we balance this equation so this equation so this will be half o two.
00:38 So here standard enthalpyopeo formation is equal to so it is minus 241 .8 kilojoule per mole.
00:49 Okay now let us consider the second equation.
00:53 So the second equation is so it is for calcium chloride and it's formed by the reaction between calcium and chloride right so calcium so when it reacts with the chloride i'm sorry chlorine it will give calcium chloride.
01:11 Okay.
01:11 Now here if we, so this is the balanced chemical equation...
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