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.
You get 10 lb/Da of a heavier molecule CO2 to get 44 Da * 10 lb/Da = 440 lb of CO2. So a mole is the number of molecules in a weight. You get the weight of molecules from the periodic table and other published tables, in Daltons. You get the weight off your scales. If you are working with molal and molar, you suppose that 1 kg or 1 Litre of solution gives x gram-moles of the named chemical.