# CHEMISTRY HELP

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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?
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?

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 -

a)
q = mass x specific heat x (Tfinal-Tinitial)

b)
Write the equation and balance it.
deltaHfrxn = (n*DHfproducts)-(n*DHfreactants)

• CHEMISTRY HELP -

You can find the delta Hf products and reactants in your text or notes.

• CHEMISTRY HELP -

nya

• CHEMISTRY HELP -

56.3

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