When the new value is greater then the old value it is a percentage increase otherwise it is a decrease. Once you have the initial and final masses of your substance subtract to determine the. You need to calculate percent increase from 5 to 15.
Calculate the Change in Mass.
M MCMS 100 Where M is the mass percent of the compound MC is the total mass of the compound. The basic formula for mass percent of a compound is. Once you have the initial and final masses of your substance subtract to determine the. Average Percent Change in Mass Average Mass Group 1 Average Mass Group 2.