Question

A coffee-cup calorimeter contains 130.0 g of water at 25.1 ∘C . A 121.0-g block of copper metal is heated to 100.4 ∘C by putting it in a beaker of boiling water. The specific heat of Cu(s) is 0.385 J/g⋅K. The Cu is added to the calorimeter, and after a time the contents of the cup reach a constant temperature of 30.2 ∘C . Determine the amount of heat, in J , lost by the copper block.

Answer 1

The heat lost by the copper block is 3270 J

Step-by-step explanation:

A coffee-cup calorimeter is an instrument used in chemistry to obtain values as enthalpy change (ΔH) or changes in internal energy (ΔU)

The equation of interest is:

Q = C×m×ΔT

Where:

Q is the amount of heat

C is specific heat (For Cu is 0,385 J/gK)

m is mass of copper (121,0g)

And ΔT is final temperature - initial temperature (30,2°C - 100,4°C)

Replacing:

Q = -3270 J

The heat lost by the copper block is 3270 J

I hope it helps!