Answers edited by David Y.
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How to calculate the first and second ionization energies of helium?

11. 135 g of aluminum (initially at #"400"^("o")"C"#) are mixed with an unknown mass of water (initially at #"25"^("o")"C"#). When thermal equilibrium is reached, the system has a temperature of #"80"^("o")"C"#. Find the mass of the water?

What is #"Gibbs Free Energy"#?

How do you calculate enthalpy change?

Can someone please explain how to find the amount of energy released in a chemical reaction? What formulas do I use and how do I use them?

Question #2e817

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Question #2171c

A 154 g sample of water at 0oC freezes into ice at °C
How many joules (J) of energy are needed for the phase change?