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The following is an explanation of the higher boiling of HF compared to HCl

In which of the following substances the molecules will have London dispersion forces as their strongest intermolecular interaction? (Hint check the shape and polarity of the molecules)

On the generic phase diagram below, the change from point E to point F describes:  

Convert 1255 mm Hg to atm

The following combination of signs for heat and work (respectively, heat first, work, next in the answer) represents a system that is losing heat to the surroundings and doing work on the surroundings?         

What is the net ionic equation for the following molecular equation? BaCl2(aq) + K2SO4(aq) →   BaSO4(s)+ 2KCl(aq)

A  25 L balloon contains 515 g of xenon at 127oC. Calculate the pressure in the ballon in atm.

Identify the subshell in which electrons with the following quantum numbers are found: n = 4, l = 2  

Which one of these compounds is an ionic compound?

Consider the following balanced reaction:  Mg(s)  +  2HCl(g)  =>  MgCl2(aq) + H2(g) Calculate the volume of H2 produced when 48.62grams of magnesium react with the excess of hydrochloric acid at 20oC and 741mm Hg.