A 145 gram sample of an unknown metal at 95.0oC is placed in 125 gram of water at 25.0oC. If the final temperature of the metal and water is 31.8oC, what is the specific heat capacity of the metal?  (the specific heat of water is 4.184 J/goC). Show all your work for full credit. Use the correct number of significant figures.

Calculate the molar mass of a gas if 0.431 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.

Calculate the molar mass of a gas if 0.611 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.

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.