PLEASE HELP

Calcium hydroxide is .

an acid
a base
a neutral

How many moles of magnesium is 3.01 x10^22 atoms of magnesium?

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

For either problem would be greatly appreciated