How many sigma (σ) and pi (π) bonds are in the molecule shown?  

Arrange LiF, HCl, HF, and F2 in order of decreasing normal boiling point.

The decomposition of magnesium carbonate is shown: MgCO3(s) → MgO(s) + CO2(g)    ΔHo = 101 kJ/mol and ΔSo = 175 J/K∙mol What condition will decrease the value of ΔG (become more negative)? I. Increase the temperature II. Increase the concentration of CO2(g)  

The density of a 5.58 m aqueous acetic acid is 1.04 g/mL. What is the molar concentration of this solution? The molar mass of acetic acid, CH3COOH, is 60.06 g/mol.

The formation of nitrogen trichloride is: N2(g) + 3Cl2(g) ⇌ 2NCl3(g)   ΔH = +232 kJ/mol Which change will increase the concentration of the product?

What is the pH of a buffer made by combining 45.0 mL of 0.150 M nitrous acid and 20.0 mL of 0.175 M sodium nitrite? The Ka of nitrous acid, HNO2, is 4.5×10–4.   

For the reaction of nitrogen and oxygen to form nitrogen dioxide, N2(g) + 2O2(g) ⇌ 2NO2(g)   Kc = 1.5×103 If the reaction mixture is found to contain 2.0 M NO2 and 0.10 M N2 and 0.10 M O2, what is the value of Q and what does this mean?

What mass (in grams) of iron (Fe, molar mass = 55.85 g/mol) is needed to experimentally produce 50.0 g of iron(III) oxide (Fe2O3, molar mass = 159.70 g/mol) in excess oxygen if the percent yield is 78.7%?                              4Fe(s) + 3O2(g) → 2Fe2O3(s)

Which atomic orbital corresponds to this set of quantum numbers in a ground state atom of boron?                         (2, 1, –1, ½)

Which molecular compound could be dinitrogen monoxide?