Discover Questions

Help on Probability please!? .Suppose 4.57 g of c8h18 is mixed with 31. g of o2. Calculate the minimum mass of c8h18 that could be left over by the chemical reaction.? What is the mass of carbon in a 5-carat diamond that contains 5.00 x 10^22 atoms of carbon? How do I solve this graphically and draw a graph?
(x-1)^2 +5 =6? Entropy and Enthropy problem?