Sublimation cannot be used to separate the mixture of salt and sand why give reason?

How many atoms are there in 5.70 mol of mg

Ahydrogen atom has 1 electron. how many bonds can hydrogen form? a) 1 b) 2 c) 3 d) 4 e) 5

Achemical reaction is done in the setup shown , resulting in a change of mass. what will happen if the same reaction is done in a sealed container that is placed on the electronic balance?