Problem: A stock solution of hydrofluoric acid is 15 M and has a density of 0.99 g/mL at 25 °C. What is the mass percent of HF at 25 °C?a. 15%b. 30%c. 45%d. 60%

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We’re being asked to determine the mass percent of HF in a stock solution of 15 M hydrofluoric acid (HF) solution.


Mass or weight percent (% by mass)is the percentage of a given element or compound within a solution. The equation used to calculate for mass percent is shown below:


mass percent = mass componenttotal mass×100

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Problem Details

A stock solution of hydrofluoric acid is 15 M and has a density of 0.99 g/mL at 25 °C. What is the mass percent of HF at 25 °C?

a. 15%

b. 30%

c. 45%

d. 60%

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