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Find molar composition from percent by mass

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50.0 g of an oxide of Chromium (Cr) was found to contain 13.28g of potassium (K), 17.68 g of Chromium (Cr) and 19.04 g of oxygen (O). Find the simplest formula...

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Solution Summary

Comparing masses of substances is not how a chemist works, a chemist must compare mole ratios, not mass ratios.

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A chemist cannot relate masses of compounds directly, he/she must always relate molar values.

One must first convert these mass values into mole values by dividing each value by their respective molar masses.

13.28 g K
--------- = ...

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