How does the law of conservation of mass apply to this reaction: Mg + HCl → H2 + MgCl2?

The equation needs to be balanced. There are fewer hydrogen atoms in the equation than magnesium or chlorine.

Only the hydrogen needs to be balanced. There are equal numbers of magnesium and chlorine.

The law of conservation of mass has already been applied. There is an equal number of each element on both sides of the equation.

Hydrogen and chlorine need to be balanced. There is an equal amount of magnesium on each side

Question

How does the law of conservation of mass apply to this reaction: Mg + HCl → H2 +  MgCl2?
		
The equation needs to be balanced. There are fewer hydrogen atoms in the equation than magnesium or chlorine.
		
Only the hydrogen needs to be balanced. There are equal numbers of magnesium and chlorine.
		
The law of conservation of mass has already been applied. There is an equal number of each element on both sides of the equation.
		
Hydrogen and chlorine need to be balanced. There is an equal amount of magnesium on each side

michele_laino · Answer

I think that your chemical reaction has to be balanced as stated in the last option