# chemistry

posted by .

use standard enthalpies of formation to calculate delta Hrxn for the following reaction. 2H2S(g)+3O2(g)-->2H2O(l)+2SO2(g) express the answer using four significant figures
Delta Hrxn = ? kJ

• chemistry -

See your other post.

• chemistry -

ÄH°reaction = sum of standard enthalpy of formation of products - sum of standard enthalpy of formation of reactants
ÄH°reaction = [ 2 X ÄH°f for H2O + 2 X ÄH°f for SO2 ] - [ 2 X ÄH°f for H2S + 3 X ÄH°f for O2 ]
ÄH°reaction = [ 2 X -285.8 + 2 X -296.8 ] - [ 2 X -20.63 + 3 X 0 ]
ÄH°reaction = [-571.6 - 593.6 ] - (-41.26)
ÄH°reaction = -1165.2 + 41.26 = -1123.94 kj

## Respond to this Question

 First Name School Subject Your Answer

## Similar Questions

1. ### Chemistry

Calculate the enthalpy change for the reaction: 2S(s) + 3O2(g) --> 2SO3(g) Use the following thermochemical equations: Reaction S(s) + O2(g) --> SO2(g) Delta H(in kJ) -296.8 2SO2(g) + O2(g) --> 2SO3(g) Delta H(in kJ) -197.0
2. ### Chemistry

Hydrogen and methanol (CH3OH) have both been proposed as alternatives to hydrocarbon fuels. a) Write balanced chemical equations for the complete combustion of hydrogen and the complete combustion of gaseous methanol. Combustion reaction …
3. ### Chemistry

Use average bond energies to calculate delta Hrxn for C(s)+2H2O(g)-->2H2(g)+CO2(g)
4. ### chemistry

use standard enthalpies of formation to calculate delta Hrxn for the following reaction. 2H2S(g)+3O2(g)-->2H2O(l)+2SO2(g) express the answer using four significant figures Delta Hrxn = ?
5. ### Chemistry

Use enthalpies of formation from the textbook to calculate the standard enthalpy of the reaction for the following methane- generating reaction of methanogenic bacteria given delta Hf of CH3NH2=-22.97kJ/mol: 4CH2NH2+2H2O----->3CH4+CO2+4NH3
6. ### Chemistry

2)Which of the following equations represents a reaction for which the delta H can be called a standard enthalpy of formation, delta Hf?
7. ### chemistry

Which of the following equations represents a reaction for which the delta H can be called a standard enthalpy of formation, delta Hf?
8. ### Chemistry

Using data from the following reactions and applying Hess's law, calculate the heat change for the slow reaction of zinc with water (answer must be in kJ/mol Zn): Zn(s) + 2 H2O(l) ----> Zn^2+(aq) + 2 OH-(aq) + H2(g) (ΔHrxn …
9. ### chemistry

Using data from the following reactions and applying Hess's law, calculate the heat change for the slow reaction of zinc with water (answer must be in kJ/mol Zn): Zn(s) + 2 H2O(l) ----> Zn^2+(aq) + 2 OH-(aq) + H2(g) (ΔHrxn …
10. ### Chemistry

Can anyone help me with these three questions?

More Similar Questions