Hydrocortisone valerate is an ingredient in hydrocortisone cream, prescribed for skin problems. its molecular formula is c26h38o6. what is the percent by mass of carbon in hydrocortisone valerate?

Answer : The percentage by mass of carbon in hydrocortisone valerate is 69.95 %.

Solution :

The molecular formula is .

The molar mass of Carbon = 12 g/mole

The molar mass of Hydrogen = 1 g/mole

The molar mass of Oxygen = 16 g/mole

First we have to calculate the mass of one mole of .

In this molecule, there are 26 carbon atom, 38 hydrogen atom and 6 oxygen atom.

Mass of 26 moles of carbon = 26 moles × 12 g/mole = 312 g

Mass of 38 moles of hydrogen = 38 moles × 1 g/mole = 38 g

Mass of 6 moles of oxygen = 6 moles × 16 g/mole = 96 g

Total mass of one mole of = 312 + 38 + 96 = 446 g

Now we have to calculate the percent by mass of carbon in hydrocortisone valerate.

%%

Therefore, the percentage by mass of carbon in hydrocortisone valerate is 69.95 %.

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im not exactly sure but i think its b!