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Question & Answer: Calculate the standard enthalpy change for the following reaction at 25 °C. Standard enthalpy…..

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October 29th, 2021

calculate the standard enthalpy change for the following reaction at 25 °c

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Question & Answer: Calculate the standard enthalpy change for the following reaction at 25 °C. Standard enthalpy…..
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Calculate the standard enthalpy change for the following reaction at 25 °C. Standard enthalpy of formation values can be found in this table 2CH3OH(g) +302(g) → 2C(),(g) +4H,O(g) Number kJ

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Calculate the standard enthalpy change for the following reaction at 25 °C. Standard enthalpy of formation values can be found in this table 2CH3OH(g) +302(g) → 2C(),(g) +4H,O(g) Number kJ

Expert Answer

calculate the standard enthalpy change for the following reaction at 25 °c

Answer

1) 2CH3OH(g) + 3O2(g) ——-> 2CO2(g) + 4H2O(g)

2×∆H°rxn = sum∆H°f(products) – sum∆H°f(reactants)

= (2×∆H°f(CO2)+4×∆H°f(H2O)) – ( 2×∆H°f(CH3OH))

= ( 2× ( – 393.5kJ ) + 4×(-241.8kJ))- 2×(-201.3kJ)

= -1754.2kJ + 402.6kJ

∆H°rxn = -1351.6kJ/2

= -675.8kJ/mole

2) X(s) + 1/2O2(g) ——> XO(s) ∆H= -627.9kJ —–eq1

XCO3(s) —–> XO(s)+CO2(g) ∆H = + 336.5kJ —–eq2

reverse eq2

XO(s) + CO2(g) —–> XCO3(s) ∆H = -336.5kJ —–eq3

add eq1 and eq3

X(s) +1/2O2(g) + CO2(g) —–> XCO3(s) ∆H = -964.4kJ

3) Exothermic reactions are

A,B,E and F

calculate the standard enthalpy change for the following reaction at 25 °c

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