Question

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1. a certain sore throat spray contains 1.40% by mass phenol. How many grams of phenol is present in 177mL of the spray? the density of the spray is 1.095 g/mL

2. a mixture contains 2.54g eucalyptol, 1.76g menthol, 3.21g methyl salicylate, and 1.95g thymol in 205.28g water. What is the percentage composition by mass for each component in the mixture? there are five components in the mixture.

Answer 1

Q1

mass of phenol in V = 177 mL; D = 1.095 g/mL

first, get mass of solution

solution mass --> D*V = 177*1.095 = 193.815 g of solution

of which 1.4% is phenol

mass phenol = 1.4/100 * 193.815

mass phenol = 2.71341 g

Q2.

%mass --> mass of i / Total mass * 100%

total mass = 2.54 + 1.76 + 3.21 + 1.95 + 205.28 = 214.74 g

then

eucalyptol = 2.54/214.74 *100 = 1.18 %

menthol = 1.76/214.74 *100 = 0.819 %

methyl salicylate = 3.21/214.74 *100 = 1.49 %

thymol = 1.95/214.74 *100 = 0.91 %

water = 205.28/214.74 *100 = 95.6 %