1. The enthalpy of vaporization of methanol is 37.4 kJ/mol at 25°C. Molar heat capacities for liquid and gaseous methanol are 81.6 J/mol K and 43.9 J/mol·K respectively. Assume that heat capacities are the constant in this temperature range. Calculate the enthalpy of vaporization at 50 °C.

1. The enthalpy of vaporization of methanol is 37.4 kJ/mol at 25°C. Molar heat capacities for liquid and gaseous methanol are 81.6 J/mol K and 43.9 J/mol·K respectively. Assume that heat capacities are the constant in this temperature range. Calculate the enthalpy of vaporization at 50 °C.

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter9: Liquids, Solids, And Materials

Section9.9: Metals, Semiconductors, And Insulators

Problem 9.10PSP

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The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).

Chemical Reactions and Equations

When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.

Question

1. The enthalpy of vaporization of methanol is 37.4 kJ/mol at
25°C. Molar heat capacities for liquid and gaseous methanol are
81.6 J/mol K and 43.9 J/mol·K respectively. Assume that heat
capacities are the constant in this temperature range. Calculate
the enthalpy of vaporization at
50 °C.

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