Question

1. How many grams of ice at -6.9 ∘C can be completely converted to liquid at...

1.

How many grams of ice at -6.9 ∘C can be completely converted to liquid at 28.4 ∘C if the available heat for this process is 4.59×103 kJ ?

For ice, use a specific heat of 2.01 J/(g⋅∘C) and ΔHfus=6.01kJ/mol .

Express your answer to three significant figures and include the appropriate units.

2.

Now consider the following set of reactions:

  1. N2 + 2O2→N2O4 ,ΔH=−8 kJ/mol
  2. N2 + O2→2NO ,ΔH=180 kJ/mol

What is the enthalpy for the following reaction?

overall: N2O4→2NO + O2

Express your answer numerically in kilojoules per mole.

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