You divide your percentage by 100. Mass Percent Formula The following equation is used to calculator the mass percent of a compound in a substance. Divide Change in.
Both values have units of grams per mole gmol.
Percentage change can be applied to any quantity that you measure over time. Next subtract the old value from the new value. Mass percent mass of element in 1 mole of compound mass of 1 mole of compound x 100 mass percent hydrogen 2 x 1008 2 x 1008 1600 x 100 mass percent hydrogen 2016 18016 x 100 mass percentage hydrogen 1119. Work out the difference increase between the two numbers you are comparing.