In the graphic, X represents which element?
31
15
11x
31
Gallium
Ga
15
Phosphorus
P
46
Palladium
Pd

30litre of li2o is 1.0002mole approximately 1 mole

Answer(28.02g/mol);

The heat added represents an energy change.

Silicon  6.0x10^23 is avogadro's number so the answer has to be 1 mole of whatever it is. since the molarity of silicon is equal to 28g/mol, this has to be the answer because 28g of si is 1 mole of si.