Reason for not using frost-free refrigerator to preserve thunderstones has to be identified. Concept Introduction: Vapor pressure is nothing but the pressure of a vapor in contact with its liquid or solid form. When a liquid and vapor are in equilibrium the pressure exerted by the vapor is called the equilibrium vapor pressure. If intermolecular force is small the vapor pressure of the substance is high and the boiling point will be low. The boiling point of a liquid is the temperature at which its vapor pressure is equal to the external pressure.

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compounds that are less harmful to the environment. The heat of vaporization of one such once widely used as refrigerants but are now being replaced by chlorofluorocarbon, tetrafluoroethane (CH₂FCF3), is 22.2 kJ/mol. 1. What mass of tetrafluoroethane must evaporate at its boiling point to freeze 360 g of water initially at 22.0°C? The heat of fusion of water is 6.01 kJ/mol; the specific heat of water is 75.3 J/(mol-'C). Give your answer to three significant figures. 2. How much P-V work is done when 100.0 grams of tetrafluoroethane evaporates at its normal boiling point (-26.30°C) against a constant pressure of 1.00 atm.? The density of liquid tetrafluoroethane at this temperature is 1.206 g/mL. Give your answer to four significant figures. 9 L-atm but are at of v 101. g por the 19

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Chapter 11, Problem 50SCQ

Interpretation Introduction

Interpretation: Reason for not using frost-free refrigerator to preserve thunderstones has to be identified.

Concept Introduction: Vapor pressure is nothing but the pressure of a vapor in contact with its liquid or solid form.

When a liquid and vapor are in equilibrium the pressure exerted by the vapor is called the equilibrium vapor pressure.

If intermolecular force is small the vapor pressure of the substance is high and the boiling point will be low.

The boiling point of a liquid is the temperature at which its vapor pressure is equal to the external pressure.

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