Calculate the heat change in joules for vaporization of 9.00 g of water at 100 ∘C.

Carbon tetrachloride, CCl4, is a liquid used as an industrial solvent and in the preparation of fluorocarbons. What is the heat of vaporization of carbon tetrachloride? CCl4(l)CCl4(g);H=? Use standard enthalpies of formation (Table 6.2).

How much heat, in joules and in calories, is required to heat a 28.4-g (1-oz) ice cube from 23.0 C to 1.0 C?

If you want to convert 56.0 g ice (at 0 °C) to water at 75.0 °C, calculate how many grams of propane, C3H8, you would have to bum to supply the energy to melt the ice and then warm it to the final temperature (at 1 bar).

Equal masses of liquid A, initially at 100C, and liquid B, initially at 50C, are combined in an insulated container. The final temperature of the mixture is 80C. All the heat flow occurs between the two liquids. The two liquids do not react with each other. Is the specific heat of liquid A larger than, equal to, or smaller than the specific heat of liquid B?

Draw a diagram like Figure 2.11 that illustrates the change in enthalpy for the chemical reaction C s 2H2 g CH4 g Which is exothermic by 74.8 kJ/mol.

Which requires the absorption of a greater amount of heat—vaporizing 100.0 g of benzene or boiling 20.0 g of water? (Use Table 8.2.)

Suppose you wanted to cool 100. g of water from 20 C to 0 C using dry ice, CO2(s). The enthalpy of sublimation of CO2(s) is 25.2 kJ/mol. What mass of dry ice should you need? (a) 033 g (b) 15 g (c) 3.5 g (d) 150 g

Differentiate between the enthalpy of formation of H2O(l)andH2O(g) . Why is it necessary to specify thephysical state of water in the following thermochemicalequation CH4(g)+2O2(g)CO2(g)+2H2O(lorg)H=?

Are changes in state physical or chemical changes? Explain. What type of forces must be overcome to melt or vaporize a substance (are these forces intramolecular or intermolecular)? Define the molar heat of fusion and molar heat of vaporization. Why is the molar heat of vaporization of water so much larger than its molar heat of fusion? Why does the boiling point of a liquid vary with altitude?