Use the following enthalpies of formations (∆Hof): C2H5OH(l) H2O(l) CO2(g) ∆Hof -278 kJ/mol -286 kJ/mol -394 kJ/mol to calculate the standard enthalpy of reaction (∆Horxn) for the following reaction: C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(l) ∆Horxn = ?

If 12.6 g of CuSO4 (molar mass 159.61 g/mol) is dissolved in water to make a 0.350 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.

What are the bond angles around a central atom with sp hybridized orbitals?

A sample of chlorine gas is confined in a 5.0 L container at 0.433 atm and 37oC. How many moles of gas are in the sample?

How much energy is evolved during the formation of 102 g of Fe, according to the reaction below? Fe2O3(s) + 2 Al(s) → Al2O3(s) + 2 Fe(s)         ΔH°rxn = -824 kJ

Determine whether the following reaction is a redox reaction. If it is, identify the element that is oxidized, the element that is reduced, the oxidizing agent, and the reducing agent. 3Ca(s) + 2N2(g) → Ca3N2(s)

What are the bond angles around a central atom with sp2 hybridized orbitals?

Determine whether the following reaction is a redox reaction. If it is, identify the element that is oxidized, the element that is reduced, the oxidizing agent, and the reducing agent. C8H18(g) + 25O2(g) → 16CO2(g) + 18H2O(l)

Use the following enthalpies of formations (∆Hof): C6H6(l) H2O(g) CO2(g) ∆Hof 49 kJ/mol -242 kJ/mol -394 kJ/mol to calculate the standard enthalpy of reaction (∆Horxn) for the following reaction: 2C6H6(l) + 15O2(g) → 12CO2(g) + 6H2O(g) ∆Horxn = ?

How many double bonds are present in the Lewis structure of NO3- in which the formal charge of nitrogen (N) is zero?