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When we are trying to find the empirical formula, we usually take the mass percent composition and turn it into grams because percent is usually out of 100. In most cases,100 gram is convenient because it reflects the mass of each element in conjunction with the percent composition which is a fraction of 100 percent.
If we start with 100g then it's easier to figure out the grams of each molecule based on the percentages given. I didn't learn to answer questions this way until recently and I think this method makes it a lot easier.
It is the easiest way to think about calculating the mass percentage of each element. So usually, when you find the mass composition, it is given in a percentage. You take this percentage out of 100 grams. For example if the mass composition of carbon was 20%, it would be 20 grams.
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