Wh en C2H2 is burned in air, carbon dioxide and water are formed in the followin

Question

Wh en C2H2 is burned in air, carbon dioxide and water are formed in the following reaction: C2H2. 0 2(g) rightarrow C02(g) + H20(l) delta ? = - 1300. kJ C(S) + 0 2(g) rightarrow C02(g) delta? = - 394. kJ; H2(g) +1/2 0 2(g) rightarrow H20(l) delta ? = - 286. kJ, Calculate delta ? for 2C(s) + H2(g) rightarrow C2H2(g) Using the data in #14 what is the Heat of Formation of H20(l). delta H1= delta? for melting sulfur (S) is 17. 7 kJ/mol. How many grams^of sulfur can be melted b y 22. 5 kJ of energy? Which of the statement(s) concerning the following is (are) correct? 2S03( g U l9 8 k J rightarrow 2S02(g) + 0 2(g) T h e reaction is exothermic. The sign of ?? for the reaction is negative. The enthalpy of the products exceeds that of the reactants

Explanation / Answer

14)

Let the given 3 reaction be numbered 1,2 and 3

main reaction can be written as 2*reaction 2 + reaction 3 - reaction 1
dont bother about extra H2 and O2 since delta H of O2 and H2 are zero

delta H = 2*delta H2 + delta H3 - delta H1
    =2*(-394) + (-286) - (-1300)
    =226 KJ
Answer: 226 KJ

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