pure sample of an organic molecule has the formula CxHyOz. If x = 12, y = 21, and z = 2. Calculate the percent by mass of oxygen in the formula. Round your result to the nearest tenth number; do not enter a % sign in your answer.

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A pure sample of an organic molecule has the formula CxHyOz. If x = 12, y = 21, and z = 2. Calculate the percent by mass of oxygen in the formula. Round your result to the nearest tenth number; do not enter a % sign in your answer.

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