Question

i need help asap. i need this in less then an hour and my grade depends on it please help. i would really appreciate the help thank you so much

8. 300 250 200 150 PE (kJ) 100 50 0 Progress of the reaction Which of the following are the values for the activation energy (E.) and change in enthalpy (AH) for the reverse reaction? A. 300 -50 B. 150 +50 C. 100 -50 D. 100 +50 Use the following information to answer the next question. 2 CH2OH(1) +3 0(g) +00,(g) + 4H20 (8) AH -1 275.8 I 9. The amount of methanol that must be burned to raise the temperature of 250.0 g of water from 20.0 C to 35.0 C is A. 6.31 x 10 mol B. 1.23 x 102 mol C. 2.46 x 10mol D. 2.46 x 10' mol 10. 52.0 g of acetylene gas, CH2, is bumed in oxygen. 4989 kJ of energy is released. What is the thermochemical equation? A. 2 CzHzte + 50210 →40024 + 2H2018 + 4997 kJ B. 2 CzHate + 5 Ozt → 4 CO2 + 2H,0 + 4989kJ C. 2 CHaig + 5 O2 → 4CO2+ 2H2O +2498 kJ D. 2 CH2 + 5 Od 4 CO2 + 2H2O +5.00 MJ

Answer 1

8.

Activation energy of Backward reaction is given as

Eactivated complex (Energy of activated complex i.e peak of curve)=300kJ

EProduct(Energy of product)=200kJ

Eactivated complex - EProduct =300-200

=100kJ

Enthalpy of reaction for backward reaction will be

Ereactant = 150 kJ

Eproducts =200 kJ

Ereactant-Eproducts

=150-200 kJ

=-50kJ

Correct option will be C

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