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HACTEHA [7]
2 years ago
15

Hydrocortisone valerate is an ingredient in hydrocortisone cream what is the percent by mass of carbon

Chemistry
1 answer:
sladkih [1.3K]2 years ago
8 0
The chemical formula of hydrocortisone valerate is C26H38O6. First, we determine the molar mass of the substance by adding up all the products of the number of atoms and the molar mass of atoms as shown below.
                        molar mass = 26(12) + 38(1) + 6(16) = 446 g/mol
Since, there are 26 atoms of carbon in each molecule, the mass of carbon in each mole is 
                     mass of carbon = (26)(12) = 312
Obtaining the percent by mass of carbon,
                           % by mass of carbon = (312/446) x 100 % 
                                                                 = 69.955%
Thus, the percent by mass of carbon in hydrocortisone valerate is approximately 69.96%. 
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5 0
3 years ago
If you add 25.0 mL of water to 125 mL of a 0.150 M LiOH solution, what will be the molarity of the resulting diluted solution?
Alborosie

Concentration is the number of moles of solute in a fixed volume of solution

Concentration(c) = number of moles of solute(n) / volume of solution (v)

25.0 mL of water is added to 125 mL of a 0.150 M LiOH solution and solution becomes more diluted.

original solution molarity - 0.150 M

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number of LiOH moles in 0.125 L  - 0.150 mol/ L x 0.125 L = 0.01875 mol

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3 years ago
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3 years ago
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