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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.  

The following name–formula pair is incorrect:  

A 0.113 g sample of an organic compound with a molar mass of 306.0 g/mol was burned in the bomb calorimeter with a heat capacity of 2.24 kJ/K. The temperature in the calorimeter increased by 3.12 K. Calculate the energy of combustion of the compound in kJ/mol.

The boiling point of H2O is higher than H2S, H2Se, and H2Te. Which of the following intermolecular attractions is responsible for the high boiling point of water?        

Which of the following substances has the strongest intermolecular forces?  

What is the percent by mass of oxygen in (NH4)2SO3?

How many protons, electrons, and neutrons (respectively) are in an atom of iodine-131?