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? A)69.9% B)43.6% C)54.2% D)76.9% E)60.1%

Question

Quizplus · Accepted Answer

The molar mass of hydrocortisone valerate is calculated by adding the atomic masses of all atoms: (26*12.01) + (38*1.01) + (6*16.00) = 446.6 g/mol. The mass of carbon is 26*12.01 = 312.26 g/mol. The percent by mass of carbon is (312.26/446.6)*100 = 69.9%.

Hydrocortisone Valerate Is an Ingredient in Hydrocortisone Cream,prescribed for Skin