Look across the same row and read the percent written. Following is a picture outlining these ideas.įor example, if you wanted to know the percent by mass of the daily value for sodium you are eating when you eat one serving of the food with this nutrition label, then go to the category marked sodium. The mass of protein is not converted to percent because their is no recommended daily value for protein. The Daily Value is based on a the mass of each category recommended per day per person for a 2000 calorie diet. Only two subcategories, Saturated Fat and Dietary Fiber are converted to percent of Daily Value. The mass for each category, except Protein, is then converted to percent of Daily Value. These categories are broken down into further subcategories, including Saturated Fat and Dietary Fiber. On all nutrition labels, a known serving size is broken down in five categories: Total Fat, Cholesterol, Sodium, Total Carbohydrate, and Protein. The nutrition label found on the container of every bit of processed food sold by the local grocery store employs the idea of percent composition. Follow steps 3 and 4: (1.00794g/36.46064g) x 100 = 2.76% Now just subtract to find the percent by mass of Chlorine in the compound: 100%-2.76% = 97.24% Therefore, HCl is 2.76% Hydrogen and 97.24% Chlorine by mass. These steps are outlined in the figure below.įor another example, if you wanted to know the percent composition of hydrochloric acid (HCl), first find the molar mass of Hydrogen. This will speed up calculations, and reduce typographical errors. If using a calculator, you can store the overall molar mass to a variable such as "A".The compounds will always add up to 100%, so in a binary compound, you can find the % of the first element, then do 100%-(% first element) to get (% second element). Multiply it by 100 to get percent composition!
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