Chemistry: Iron (iii) chloride + sodium carbonate → iron (iii) carbonate + sodium chloride which of these is the balanced equation for the reaction described above?

Iron (iii) chloride + sodium carbonate → iron (iii)

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09.10.2020

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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