Mg(s) + 4 HNO3 --> Mg(NO3)2 + 2NO2 +2H2O
A student has 3.00 grams of a mixture. It is known that the mixture contains Zinc and Magnesium powder. The student is given the task of determining the percent of Magnesium in the mixture.
In order to determine the percent, the student reacts the mixture with 17.5 mL of 12.7 M HNO3, inside of a fume hood, so that the nitric oxide gas does not poison the student.
The student determines that the reaction produced 0.030 mol of Mg(NO3)2. Based on the measurements, what was the percent Mg by mass in the original 3.00 g sample of the mixture?