In this lesson you’ll learn how to find the molar mass of chemical compounds given the molar mass of individual atoms, and how to find the molar mass of individual atoms given the molar mass of a compound or molecule.
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In this lesson you will learn how to set up and solve ratio and proportion word problems. For word problems, the best thing to do is to look at a few examples but first let’s review a few vocabulary terms. Ratio: A ratio is a comparison of two items and it is often written as a fraction. Proportion: A proportion is an equality between two ratios.
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When you have complex fractions as a proportion you can solve for the variable or rewrite them by using cross multiplication. After cross multiplication, you’ll end up with a fraction set equal to another fraction, and you can then use cross multiplication a second time.
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Because the two ratios in a proportion are equal to each other, a proportion is an equation that expresses the equivalence of two fractions. So a ratio is just a fraction, and a proportion is an equation that sets two fractions equal to each other.
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