Which of the following pure substances has the lowest

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21.Which of the following pure substances has the lowest melting point?A)NaFB)LiFC)CsFD)RbFE)KF
22.For an ideal gas, which of the following statements is true?
23.The density of a gas is 3.17 g/L at STP. What is its molar mass?
24.The volume of a sample of gas measured at 10.0°C and 1.00 atm pressure is 9.00 L. What must the finaltemperature be in order for the gas to have a final volume of 6.00 L at 1.00 atm pressure?
25.A particular compound has an enthalpy of vaporization of 28100 J/mol. At 276 K it has a vapor pressureof 103 mmHg. What is its vapor pressure at 304 K?(R= 8.31 J/(K· mol))A)99.9 mmHgD)106 mmHgB)318 mmHgE)33.3 mmHgC)171 mmHg
26.For a particular liquid, raising its temperature from 335 K to 353 K causes its vapor pressure to double.What is the enthalpy of vaporization of this liquid?(R= 8.31 J/(K· mol))
27.How much heat is released at constant pressure if a 13.0-L tank containing 40.0 atm of hydrogen sulfidegas condenses at its boiling point of -60.0oC?The enthalpy of vaporization of hydrogen sulfide is 18.7kJ/mol at -60.0oC.(R= 0.0821 L • atm/(K • mol))JJ
28.The normal boiling point of a liquid is

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Term
Fall
Professor
DARKUSJENKINS

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