Define conversion factor in chemistry? define conversion factor in chemistry

Calculate the number of molecules present in 0.750 mol of mgo.

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?

Explain that newton first law,second law and third law of motion?