Use the following enthalpies of formations (∆Hof): CH4(g) HCN(g) NH3(g) ∆Hof -74.6 kJ/mol 135.5 kJ/mol -45.9 kJ/mol to calculate the standard enthalpy of reaction (∆Horxn) for the following reaction: CH4(g) + N2(g) → HCN(g) + NH3(g) ∆Horxn = ?

In the fermentation process, yeast converts glucose to ethanol and carbon dioxide. What volume of carbon dioxide, measured at 745 torr and 25.0°C, can be produced by the fermentation of 16.0 g of glucose? C6H12O6(aq)  → 2C2H5OH(aq)   + 2CO2(g)

An antacid tablet contains NaHCO3. What mass of this compound is required to neutralize 125 mL of 2.75 M HCl? NaHCO3(aq) + HCl(aq) → NaCl(aq) + CO2(g) + H2O(l)

A 155 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 29.5oC, 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.

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