2. The specific heat of octane, C8H18(0), is 2.22 J/g-K. a. How many J of heat are needed to raise the temperature of 80.0 g of octane from 10.0 to 25.0 °C? b. Which will require more heat, increasing the temperature of 1 mol of C3H18(0) by a certain amount or increasing the temperature of 1 mol of H2Ou by the same amount?

If the heat of solution of a salt is highly endothermic and 100 g of that salt are dissolved in 1 L of water, what would you observe? O a. The solution would feel hot to your touch. Ob. The solution would feel cold to your touch. Oc. The salt would not dissolve. Od. You cannot tell about the enthalpy of solution from touching a newly made solution.

4. An ice cube at a temperature of -4.0°C has a mass of 7.0 g. You add 150. mL of hot water (90.0°C) to the ice cube. The water cools to 50.00°C. Calculate the heat of fusion (Q) in kJ and the enthalpy of fusion (AH) in kJ/mol.

1. How many joules of energy would be required to raise the temperature of 3.2 grams of mercury 4.2°C? The specific heat of mercury is 0.14 J/(g.°C).

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Mixing 50 ml of HCI ( 2.0 M) with 50 ml of NaOH ( 2.0 M ) raises the temperature of the calorimeter from 23.0 C to 31.0 C. What is the heat of reaction per mol of HCI ? 40.3 KJ/mol 32.2 KJ/mol O 38.4 KJ/mol 33.5 KJ/mol

Ethyl alcohol, C2H5OH, has a specific heat of 2.40 ?? °?. Which of the following statements best describes what this means? a) It takes 1 joule of energy to increase the temperature of 1 gram of ethyl alcohol by 2.40 °C. b) It takes 1 joule of energy to increase the temperature of 2.40 grams of ethyl alcohol by 1 °C. c) It takes 2.40 joules of energy to increase the temperature of 1 gram of ethyl alcohol by 1 °C. d) It takes 2.40 joules of energy to increase the temperature of 2.40 grams of ethyl alcohol by 1 °C

A sample of 175°C copper is placed into a beaker with 100 grams of 25°C water. Which sample of copper will heat the water to the lowest final temperature? The specific heat of copper is 0.385 J-g-1.°C-1. The specific heat of water is 4.184 J·g-1.°C-1. A. 5.0 g Cu B. 2.0 g Cu C. 0.5 g Cu D. 1.0 g Cu