What is the percent by mass of a solution containing 12.3g of caffeine dissolved in 100.g of water?Group of answer choices11.0%1.00%12.3%0.123%
Question
What is the percent by mass of a solution containing 12.3g of caffeine dissolved in 100.g of water?Group of answer choices11.0%1.00%12.3%0.123%
Solution
The percent by mass of a solution is calculated by the formula:
(mass of solute / mass of solution) * 100%
In this case, the mass of the solute (caffeine) is 12.3g and the mass of the solution is the mass of the solute + the mass of the solvent (water), which is 12.3g + 100g = 112.3g.
So, the percent by mass of the caffeine in the solution is:
(12.3g / 112.3g) * 100% = 10.96%
Rounding to the nearest tenth gives us 11.0%. So, the correct answer is 11.0%.
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