Just having trouble again with a few questions. 1.Calcium oxide (lime) is a white crystalline solid with a melting point of 2572c. It is manufactured by heating limestone, coral, sea shells or chalk, which are mainly CaCO3, to drive off carbon dioxide, according to the following reaction. CaCO3(s) --> CaO(S) + CO2(g) Kp= 1.16 atm at 800c If 20.0g of CaCO3 were sealed in a 10.0L container and heated to 800c, what percentage of CaCO3 would remain unreacted at equilibrium? 2.A saturated solution of iodine in water contains 0.330g I2 per litre, but more than this amount can dissolve in a potassium iodide solution because of the following equilibrium. I-(aq) + I2(aq) <--> I3- (aq) A 0.100 M KI solution dissolves 12.5g of I2 per litre, most of which is converted to I3-(aq). Assuming that the concentration of I2(aq) in all saturated solutions is the same, calculate the equilibrium constant for the above reaction. I know Kc= [I3-]/[I-][I2], but I don't know where to go from there. 3. What is the longest wavelength of light that the ground state C2+ ion will absorb? For this question, an MO diagram is given with energy in electron volts. I'm assuming you need to convert the energy in to joules (multiply by 1.602*10^-19) and use E=hc/lambda, but I don't know where to measure the energy from. Any help would be great.