The catch is that the audio CD is uncompressed. While you might have been able to put seven or eight hours of MP3s onto a single data CD before, youâre out of luck with an audio CD. These contain only about 70 minutes or so. It may take several audio CDs to hold what you might currently have on a single data CD.
Example 1: mass percent = (mass of chemical/total mass of compound) x 100 = (5 g/105 g) x 100. Example 2: We want to rearrange the mass percent equation to solve for the unknown mass of the chemical: mass of the chemical = (mass percent*total mass of the compound)/100 = (15*175)/100. 5. Calculate the mass percent.
-- ANSWER: First, according to Step 1, we must find the molecular weight of the compound. To do that we multiply the atomic weight of each element by the number of times it occurs in the compound: (9 * 12.011) + (20 * 1.008) = 128.259 grams per mole.) For each element in the compound, multiply the atomic weight of that element by the number of times it occurs in the compound. Do this for each element you want to know the weight percent for. See the example below for more about how to do this.