Carbon Dating Help

I was given lab data on a sample of organic chemistry, and I need help dating it. The data is as follows: 1. the delta value for the 13-C (carbon 13) = -7.2 2. 14-C (carbon 14) activity = 8.16 dpm/g I need help calculating the age of this carbon, and if possible, corrected for isotopic fractionation.

Finding Eh of Uranium Isotopes

I need to find the Eh (electromotive force) of this solution before I can procede: the solution has U4+ / U3+ = 100

Calculating Ferric and Ferrous Concentrations

Calculating Ferric and Ferrous Concentrations - please see the attachment. Thanks.

Effects of higher MPG in US petroleum consumption

Petroleum consumption in the US in 1990 supplied about 33.7E15 kJ of energy. Of this quantity, about 15.9E15 kJ was supplied by foreign sources. The transportation sector is the major user of petroleum, accounting for 23.2E15 kJ of consumption. Overall automobile fuel economy in the US was about 21 miles per gallon in 1990. Automobile efficiencies in Europe and Japan were about 27mpg. If the US had averaged 27 mpg in 1990, how much less petroleum (expressed as kJ) would have been imported?

Iron concentration given pH and pE values

At pH 6.00 and pE 2.90, what is the concentration of Fe2+ (mol/L) in equilibrium with Fe(OH)3?