We are asked to calculate for the** percent by mass (mass %) of O in ****digitoxin, C _{41}H_{64}O**

$\overline{){\mathbf{mass}}{\mathbf{}}{\mathbf{percent}}{\mathbf{}}{\mathbf{=}}{\mathbf{}}\frac{\mathbf{mass}\mathbf{}\mathbf{element}}{\mathbf{total}\mathbf{}\mathbf{mass}\mathbf{}\mathbf{of}\mathbf{}\mathbf{compound}}{\mathbf{\times}}{\mathbf{100}}}$

For the **percent by mass C**, we’re going to rewrite the equation as:

$\overline{){\mathbf{\%}}{\mathbf{}}{\mathbf{mass}}{\mathbf{}}{\mathbf{C}}{\mathbf{}}{\mathbf{=}}{\mathbf{}}\frac{\mathbf{mass}\mathbf{}\mathbf{C}}{\mathbf{mass}\mathbf{}{\mathbf{C}}_{\mathbf{41}}{\mathbf{H}}_{\mathbf{64}}{\mathbf{O}}_{\mathbf{13}}}{\mathbf{\times}}{\mathbf{100}}}$

*We will do the following steps to solve the problem:*

*Step 1: Calculate the mass of 1 mole of C*

*Step 2: Calculate the mass of 1 mole of digitoxin, C _{41}H_{64}O_{13}*

*Step 3: Calculate the percent by mass of C in **digitoxin, C _{41}H_{64}O*

Calculate the percentage by mass of oxygen in the following compounds.

digitoxin, C_{41}H_{64}O_{13}

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Mass Percent Formula concept. You can view video lessons to learn Mass Percent Formula. Or if you need more Mass Percent Formula practice, you can also practice Mass Percent Formula practice problems.