How does graphite act as an lubricant

How many grams of co(g) are there in 74.5 ml of the gas at 0.933 atm and 30o c?

In apex! a liquid heated beyond a certain temperature becomes

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