Homework Help: CHEMISTRY HELP

Posted by Jen on Monday, October 17, 2011 at 7:37pm.

1) The specific heat of solid copper is 0.385 J/g(C). What thermal energy change occurs when the temperature of a 34.10 g sample of copper is cooled from 35.7 degrees Celsius to 13.9 degrees Celsius?
Answer: -286.3 J
This amount of heat is used to melt solid ice at 0.0 degrees Celsius. The molar heat of fusion of ice is 6.00 kJ/mol. How many moles of ice are melted?
Answer: ???

2) Brazilians are quite familiar with fueling their automobiles with ethanol, a fermentation product from sugarcane. Calculate the standard molar enthalpy for the complete combustion of liquid ethanol (C2H5OH) using the standard enthalpies of formation of the reactants and products.
C2H5OH(l) + 3O2(g) --> 2CO2(g) + 3H2O(g)

CHEMISTRY HELP - DrBob222, Monday, October 17, 2011 at 8:23pm
a)
q = mass x specific heat x (Tfinal-Tinitial)

b)
Write the equation and balance it.
deltaHfrxn = (n*DHfproducts)-(n*DHfreactants)
CHEMISTRY HELP - DrBob222, Monday, October 17, 2011 at 8:24pm
You can find the delta Hf products and reactants in your text or notes.

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