# Question: 1 when 106 g of water at a temperature of...

###### Question details

1.

When 106 g of water at a temperature of 23.5 °C is mixed with 63.3 g of water at an unknown temperature, the final temperature of the resulting mixture is 47.9 °C. What was the initial temperature of the second sample of water? (The specific heat capacity of liquid water is 4.184 J/g ⋅ K.)

Initial temperature = °C

2.

You add 100.0 g of water at 56.3 °C to 100.0 g of ice at 0.00 °C. Some of the ice melts and cools the water to 0.00 °C. When the ice and water mixture reaches thermal equilibrium at 0 °C, how much ice has melted? (The specific heat capacity of liquid water is 4.184 J/g ⋅ K. The enthalpy of fusion of ice at 0 °C is 333 J/g.)

Mass of ice = g

3. The salt **cesium perchlorate** is soluble in
water. When **4.06** g
**CsClO _{4}** is dissolved in

**105.00**g water, the temperature of the solution decreases from

**25.00**°C to

**22.70**°C. Based on this observation, calculate the dissolution enthalpy, Δ

_{diss}

*H*, of

**CsClO**.

_{4}Assume that the specific heat capacity of the solution is 4.184 J g

^{-1}°C

^{-1}and that the energy transfer to the calorimeter is negligible.

Δ_{diss}*H* = kJ/mol