Byron S. answered • 11/21/14

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Hi Trenda,

As the two amounts of ethanol mix, energy is transferred from one to the other as heat, until an equilibrium temperature T is reached.

The formula for this heat transfer is

Q = mcΔT

Q is the heat, m is the mass, c is the specific heat of the material, and ΔT is the change in temperature.

Q = 25.0g * c * (T - 5.0 °C) = 50.0g * c * (75.0 °C - T)

Normally you'd need to know c, but since both are the same material, these cancel

25(T-5) = 50(75-T)

You can solve this fairly easily now for the final temperature T.

Trenda M.

11/21/14