Calculate the enthalpy change for the following reaction: 2NO2(g) → N2(g) + 2O2(g) ∆H = ? Given the following reactions and their ∆H values: N2(g) + O2(g) → 2NO(g) ∆H = 180.5 kJ 2NO(g) + O2(g) → 2NO2(g) ∆H = -114.12 kJ

If 4.99 g of CuSO4 (molar mass 159.61 g/mol) is dissolved in water to make a 0.250 M solution of CuSO4, what is the volume of the solution in milliliters ? Show all your work for full credit. Use the correct number of significant figures.

Calculate the enthalpy change for the following reaction: 2Hg(l) + Cl2(g) → Hg2Cl2(s)  ∆H = ? Given the following reactions and their ∆H values: HgCl2(s) → Hg(l) + Cl2(g)  ∆H = 224.0 kJ Hg(l) + HgCl2(s) → Hg2Cl2(g) ∆H = -41.2 kJ

A sample of 0.525 mol of SO2 occupies a volume of 2.25 L. What will the volume be if the number of moles of SO2 is increased to 0.825 mol, with no change in temperature or pressure ?

An antacid tablet contains NaHCO3. What mass of this compound is required to neutralize 105 mL of 2.75 M HCl? NaHCO3(aq) + HCl(aq) → NaCl(aq) + CO2(g) + H2O(l)

Select the statement that best describes the relationship between gas pressure and volume (Boyle’s law).

Calculate the molar mass of a gas if 0.183 g of this gas occupies 0.280 L at 0.930 atm and 295 K. Show all your work for full credit. Use the correct number of significant figures.

What is the final volume of a sample of gas initially occupying 3.75 L at 5.0oC and 1.40 atm pressure after its pressure is increased to 5.25 atm and its temperature is increased to 57.0oC?

Calculate the molar mass of a gas if 0.728 g of this gas occupies 0.250 L at 0.955 atm and 297 K. Show all your work for full credit. Use the correct number of significant figures.

A sample of 0.775 mol of CO2 occupies a volume of 1.50 L. What will the volume be if the number of moles of CO2 is increased to 1.25 mol, with no change in temperature or pressure ?