Jun 12, 2014 · delta Sh = -Q / Th For the cold object, the entropy change is (Q/Tc), positive because the heat is transferred into the object. delta Sc = Q / Tc So the total entropy change for the whole system would be given by the equation Sf = Si - Q / Th + Q / Tc with Si and Sf being the final and initial values of the entropy.

Apr 23, 2009 · With given reaction and thermodynamics quantities, you can calculate delta H easily. Make sure you write units along the calculation. Isothermal Expansion. Isothermal Expansion of an ideal gas. You stay on the isotherm throughout the entire expansion which means that \(\Delta E = 0\) and \(q = -w\).

Jun 12, 2014 · delta Sh = -Q / Th For the cold object, the entropy change is (Q/Tc), positive because the heat is transferred into the object. delta Sc = Q / Tc So the total entropy change for the whole system would be given by the equation Sf = Si - Q / Th + Q / Tc with Si and Sf being the final and initial values of the entropy. Mar 29, 2019 · Once you have m, the mass of your reactants, s, the specific heat of your product, and ∆T, the temperature change from your reaction, you are prepared to find the enthalpy of reaction. Simply plug your values into the formula ∆H = m x s x ∆T and multiply to solve. Your answer will be in the unit of energy Joules (J). Nov 18, 2010 · Consider the reaction 4 FeO(s) + O2(g) --> 2 Fe2O3(s) and heat-of-formation data Fe + 1/2 O2(g) --> FeO \u0001 delta(H) = −273 kJ/mol 2 Fe + 3/2 O2 --> Fe2O3 delta(H) = −824 kJ/mol Find the change in enthalpy. Your answer must be within ± 0.1%

And the first law of thermodynamics at constant pressure becomes delta H equals qp. The subscript p denotes the heat supplied q in at constant pressure. This equation is very important and is given as equation four. So in summary, the first law of thermodynamics arises from the application of the law of conservation of energy to thermodynamic systems.