Friday

October 31, 2014

October 31, 2014

Posted by **mohd** on Sunday, April 11, 2010 at 3:57pm.

2Cu(s)+S(s) give Cu_2S(s) delta H -79.5 KJ

S(s)+O_2 give SO_2(g) -297 KJ

Cu_2S(s)+2O_2(g) give 2CuO(s)+SO_2(g)

how i calculate standard enthalpy of formation in Kj per mol of CuO(s)?

please dont give the answer only guid me please

- chemistry -
**DrBob222**, Sunday, April 11, 2010 at 4:06pmAdd equation 1 to the reverse of equation 2 to equation 3. That will give you twice the equation you want and you can take half of it later.

Add kJ/mole for equation to the negative of equation 2 to the kJ for equation 3. All of that together gives twice what you are looking for so divide the total by 2 and divide the equation by 2.

- chemistry -
**mohd**, Sunday, April 11, 2010 at 4:12pmin front of last equation i forgat to wright the delta H .it is -527.5 KJ

- chemistry -
**DrBob222**, Sunday, April 11, 2010 at 4:14pmThat doesn't change anything. When you reverse an equation change the sign of delta H, otherwise leave it.

**Answer this Question**

**Related Questions**

chemistry 211 Lamar Univ - Calculate the number of SO_2 molecules in 9.19 moles ...

Chemistry - Copper metal can be obtained by heating copper oxide in the presence...

chemistry - Which of the following equations represents a reaction for which the...

Chemistry - CONTINUE>>>>>>>>>>> The enthalpy ...

Chemistry - 2)Which of the following equations represents a reaction for which ...

Chemistry - The following reaction has a standard enthalpy of reaction of -146.0...

Chemistry - Mg(s) + 2HCl(aq) -> MgCl2(aq) + H2(g) delta H1? MgO(s) + 2HCl(aq...

Chemistry - 1)Which thermochemical equation and data does not agree with the ...

chemistry - The standard enthalpy of combustion of C2H6O(l) is -1,367 kJ mol-1 ...

Chemistry(Please check) - 1)A piece of metal with a mass of 5.50 grams changed ...