# chemistry

For the reaction shown below complete the following calculations.

H2(g) + C2H4(g) --> C2H6(g)

(a) Estimate the enthalpy of reaction using the bond energy values in Table 9.4.

(b) Calculate the enthalpy of reaction, using standard enthalpies of formation. (ΔH°f for H2, C2H4, and C2H6 are 0, 52.3 kJ/mol, and -84.7 kJ/mol, respectively.)

I'm not sure how to calculate this. I added the bond energies together from the left side, but wasn't sure if I even did that right

1. 👍 0
2. 👎 0
3. 👁 468
asked by hannah
1. BE reactants - BE products
delta Hf products - delta Hf reactants.

1. 👍 0
2. 👎 0
2. (a) Bonds on the left side break by absorbing (+) energy and bonds on the right side form releasing (-) energy. Look up the bond energies and set up:
∆Hrxn = E(H-H) + E(C=C) + 4E(C-H) - E(C-C) - 6(C-H).
Look up and combine six positive energies on the left with seven negative energies on the right.

(b) set up
∆Hrxn = ∆Hf(C2H6) - {∆Hf(H2) + ∆Hf(C2H4)}
Look up the energies of formation and substitute in the above equation. When you combine them be careful with algebraic signs.

1. 👍 0
2. 👎 0
posted by GK

## Similar Questions

1. ### Chemistry

In the dehydrogenation of ethane two reactions take place: C2H6 => C2H4 + H2 C2H6 + H2 => 2CH4 The mass distribution of the product is: 27% C2H6; 33% C2H4; 13% H2; 27% CH4. 1. What was the conversion of C2H6 to CH4? 2. What was

asked by Hoang on November 24, 2016
2. ### Chmistry

For the following reaction, 4.35 grams of hydrogen gas are allowed to react with with 10.3 grams of ethylene (C2H4). hydrogen (g) + ethylene (C2H4) (g) ethane (C2H6) (g) What is the maximum amount of ethane (C2H6) that can be

asked by Austin Jekins on December 4, 2010
3. ### Chmistry

For the following reaction, 4.35 grams of hydrogen gas are allowed to react with with 10.3 grams of ethylene (C2H4). hydrogen (g) + ethylene (C2H4) (g) ethane (C2H6) (g) What is the maximum amount of ethane (C2H6) that can be

asked by Austin Jekins on December 4, 2010
4. ### Chemistry

Calculate the enthalpy change for: C2H4(g) + H2 --> C2H6(g) delta Hrxn: H2(g) + 1/2O2 --> H2O (l) C2H4(g) + 3O2 --> 2H20(l) + 2CO2(g) C2H6(g) + 7/2O2(g) --> 3H20(l) + 2CO2(g) I know I have to flip the third reaction but I don't

asked by Jessica on October 29, 2014
5. ### chemistry

Consider the reaction, C2H4(g) + H2(g) ® C2H6(g), where DH = – 137 kJ. How many kilojoules are released when 55.3 g of C2H4 reacts?

asked by Cooper on October 21, 2011
6. ### Chemistry

1)Which thermochemical equation and data does not agree with the other two written? a) 2NO (g)+ O2 (g) ->2 NO2 (g) deltaH=-169.8 b) NO (g) + 1/2 O2 (g) -> NO2 (g) delta H = -56.6 c) 4 NO2 (g) -> 4 NO (g) + 2 O2 (g) delta H =

asked by Rick on January 22, 2012
7. ### chemistry

Calculate the value of DHo for the reaction 2 CH4 (g) -> C2H6 (g) + H2 (g) given the following thermochemical equations: C2H2 (g) + H2 (g) -> C2H4 (g) delta = – 175.1 kJ C2H6 (g) -> C2H4 (g) + H2 (g) Delta = + 136.4 kJ C2H2 (g)

asked by timmy on January 23, 2012
8. ### chemistry

Calculate the value of ΔHo for the reaction 2 CH4 (g) -> C2H6 (g) + H2 (g) given the following thermochemical equations: C2H2 (g) + H2 (g) -> C2H4 (g) ΔHo = – 175.1 kJ C2H6 (g) -> C2H4 (g) + H2 (g) ΔHo = + 136.4 kJ C2H2 (g) +

asked by rhea on January 25, 2012
9. ### chemistry

1. Calculate the standard enthalpy change for the reaction: C2H4(g) + H2(g) → C2H6(g) given that the enthalpy of combustion for the reactants and products are: ΔHºc(C2H4)(g) = -1411 kJ mol^-1 ΔHºc(C2H6)(g) = -1560 kJ mol^-1

asked by John on July 19, 2014
10. ### chemistry

Consider the reaction, C2H4 (g) + H2 (g)- C2H6 (g) where -137kJ of heat is released. How many kilojoules are released when 55.3g of C2H4 reacts?

asked by Sandy on July 10, 2011

More Similar Questions