A  75.0 L balloon contains 215.18 g of neon at 27oC. Calculate the pressure in atm,  in the ballon.

An _____ reaction results when the energy released by the formation of products is greater than the energy required to break the bonds in the reactants.

If 0.500  mol of hydrogen gas completely reacted with 0.5000 mol of bromine gas at constant pressure, releasing 46.25 kJ of heat, which of the following thermochemical equations is correct?

If 9.00  mol of hydrogen gas completely reacted with 3.000 mol of nitrogen gas at constant pressure, releasing 277 kJ of heat, which of the following thermochemical equations is correct?

A 30.0 L cylinder contains 122.0 g of oxygen gas at 25oC. What is the pressure of the gas in torr?

A 0.213 g sample of an organic compound with a molar mass of 386.0 g/mol was burned in the bomb calorimeter with a heat capacity of 2.54 kJ/K. The temperature in the calorimeter increased by 4.12 K. Calculate the energy of combustion of the compound in kJ/mol.

Which one of these compounds is an ionic compound?

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

If the heat produced by the reaction of combustion of 1 mole of ethanol is 8 kJ/mol, (see the thermochemical equation below), how much heat in kJ is produced by the combustion of 155 g of ethanol at the same conditions (MMethanol= 46.07 g/mol)? C2H6O(g) + 3O2(g)  → 2CO2(g) + 3H2O(g);       ∆H°rxn=−1366.8 kJ/mol  

120.0g  of helium occupies a 15.25 L cylinder which is heated until the pressure is 150 atm. What is the temperature (in oC) of the gas?