31 Answered Questions for the topic Enthalpy

10/15/15

Enthalpty stoichiometry problem?? PLEASE help??!!
The value of H for the reaction below is -72 kJ. _______kJ of heat are released when 1.0 mol of HBr is formed in this reaction. H2 (g) + Br2(g) => 2HBr (g) I tried to solve it.. 1.0 mol HBr (-72... more
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10/14/15

Enthalpy of reaction problem? Please help?
Can you please help me?? I am so lost on how to solve this, and would love to see exactly how to do it. I know you have to break up the compounds into ions if they are aq, but not much else. In... more
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06/10/15

When methanol, CH3OH, is burned in the presence of oxygen gas, O2, a large amount of heat energy is released, as shown in the combustion reaction below.
Based on the balanced thermochemical reaction above, how much heat is produced when 23.9 g of methanol react with 37.1 g of oxygen?     Equation Given:   CH3OH(g) + 3/2O2(g) --> CO2(g) +... more
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Enthalpy Chemistry Entropy

03/25/15

Chemistry enthalpy/ entropy help!!
Use Hess’s Law to determine the ΔH for the combustion of liquid methanol (CH3OH). Using your answer from the previous question, how much energy will you get from burning 230.0 g of methanol in... more
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Enthalpy Chemistry Entropy

03/25/15

Chemistry help?? Please show work so i will be able to do it on my own!
If I have 45.0 grams of carbon in one pile and 60.0 grams of carbon in the other, which sample of carbon has more entropy?   If a reaction is endothermic and has a positive ΔS, what should you do... more
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Enthalpy Chemistry Lab

12/30/14

what is a good experiment used t suggest if NaCl or KCl has a higher lattice energy
i have to design an experiment to determine whether sodium chloride or potassium chloride has a higher lattice energy and show calculations to prove the experiment can be used
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