Calculate the energy absorbed/released, in kJ, when 12.72 g of liquid water is turned to ice. Be sure to use the proper sign (- or + ) in your answer. AHfus = 6.02 kJ/mol

When 5.6 grams of KOH solid is added to 100 grams of water at 30 ° C and completely dissolved, the temperature of the water rises by 40 ° C. What is the molar dissolution heat of KOH solid in water?(KOH 56 g/mol, em:4,2 j/g C)

How much heat (in J) is released when 0.9 L of water freezes at 0.0°C? The heat of fusion of water (the heat required to freeze it) is -6000 J/mol. The density of water is 1.0 g/ml.

CH4(g) +20₂(g) AH₁-890 kJ -890 kJ -90 kJ -800 kJ What is the heat necessary to evaporate one mole of water at constant pressure? +90 kJ AH₂ =-800 kJ +45 kJ CO₂(g) + 2H₂O(g) CO₂(g) + 2H₂O(1) AH₂ = ?

After an afternoon party, a small cooler full of ice is dumped onto the hot ground and melts. If the cooler contained 7.30 kg7.30 kg of ice and the temperature of the ground was 38.5 °C,38.5 °C, calculate the energy that is required to melt all the ice at 0 °C.0 °C. The heat of fusion for water is 80.0 cal/g.

Calculate the amount of energy absorbed when 75g ice @ -4C melts to 31 C Did a phase change occur? If so, which one?    Is this endothermic or exothermic?

How much heat, in joules and in calories, must be added to a 89.1 g chromium block with a specific heat of 0.450 J/g·°C to increase its temperature from 25°C to its melting temperature of 1907°C?

Calculate the amount of heat (in joules) required to heat 43 grams of water from 28°C to the normal boiling point (100°C)

How many kilojoules of heat energy are absorbed by a 200. g block of ice from -10 C to 0 C?

A: 4.91 g of LiCl was dissolved in 50.0 mL of water in the same calorimeter as in problem 1. Analysis of the thermogram showed the initial temperature to be 22.9°C, the final temperature to be 49.2°C. Was the dissolution of the ionic solid exothermic or endothermic?   B: Using the information above, calculate the mass of the water.   C: Calculate ΔHsolution   D : Calculate the standard molar enthalpy of solution. Assume that the pressure is 1 bar.