Before beginning a refrigerant recovery procedure, it is ALWAYS necessary to; A) allow the appliance to stabilize at room temperature.
B) know the type of refrigerant that is in the system.
C) remove the appliance to an outdoor location.
D) disconnect the appliance from its power source.

Can someone me with these questions plz.

How many atoms are there in 5.70 mol of mg

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