Chemistry: 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?

solid ice, when heated, turning into liquid waterExplanation:...

Hydrocortisone valerate is an ingredient in hydrocortisone

butt1562

25.05.2020

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

Solution :

The molecular formula is $C_{26}H_{38}O_6$ .

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 $C_{26}H_{38}O_6$ .

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 $C_{26}H_{38}O_6$ = 312 + 38 + 96 = 446 g

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

% $\text{ mass of carbon}=\frac{\text{ mass of carbon}}{\text{ total mass}}\times 100= \frac{312g}{446g}\times 100=69.95$ %

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

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