Please help on question 7 and 8

Consider the following reaction at equilibrium. 2co2 (g) 2co (g) + o2 (g) h° = -514 kj le châtelier's principle predicts that the equilibrium partial pressure of co (g) can be maximized by carrying out the reaction a. at high temperature and high pressure b. at high temperature and low pressure c. at low temperature and low pressure d. at low temperature and high pressure e. in the presence of solid carbon

Describe the forces both attractive and repulsive that occur as two atoms move closer together.

How many grams of phosphorus are contained in 5.09 moles of phosphorus?