The answer to this is solved through stochiometry: the answer is this: 0.0833mol
A mole of magnesium is the number of gra ms of magnesium corresponding to its mass numbers
We can use the combined gas law equation to solve for the initial volume

parameters for the first instance are on the left side and parameters for the second instance are on the right side of the equation
substituting the values in the equation

V = 8.50 L
the initial volume is 8.50 L
When you mix 0.1 M HCI, with a drop of brothymol blje, this will make the incubator to change from blue to yellow.