What is the mass in grams of MgO that is produced from 2 moles of Mg in (2mg +O2 = 2MgO)

The correct answer would be b) volume versus temperature, because they are also directly proportional.

The phase where ice changes directly to gas is called sublimation 

The question is incomplete. complete question is attached belowanswer: correct answer is option b  i.e.  solid particles  reason: filter paper has small pores, through which smaller particles can pass through. however, solid particles  have relatively larger size. hence, they are least likely to pass through.

Bis the answer to the question