Calculating Heat Change in a Phase Change or a Chemical Change The amount of heat released or absorbed by either a phase or chemical change will depend on several factors: a)
moles of substance (n)
b)
molar enthalpy of the phase or chemical change (∆H)
Formula:
q = n∆H
Examples: 1.
Calculate the amount of heat required to melt 50.0 g of ice. ∆Hfus = 6.02 kJ/mol
Note: No temperature change is given since this is a phase change
2.
Calculate the heat change that should occur when 10.4g of calcium chloride is formed from its elements at SATP. For calcium chloride the ∆Hf = - 795.4 kJ/mol
3.
A 5.00g sample of benzene was burned at SATP conditions resulting in the release of 209.2 kJ of heat. Calculate the molar heat of combustion.
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are the heat surrounding a fire, the heat given off by an electric heater, and the heat near a hot oven. 14. 16. 32. 47. 62. 71. 83. 94. 106. 118. 131. 132. 149. 164.
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There are also two uni-directional routes: metabolic heat (M) increases the thermal load ...... Plus, http://www.nlm.nih.gov/medlineplus/airpollution.html. 2.
The heat supplied during melting is used to set the solid atoms free so that a liquid can be ... A lot of heat energy is required to free the solid atoms, so the latent.
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Page 1 of 6. Calculating pH 1. Calculating pH. How is pH related to the concentration of hydronium ions? Why? In biology and other science courses pH is ...
