300 g of table vinegar contains 9 g of acetic acid. Determine the mass fraction of acid in table vinegar.

Given: m (solution) = 300 g, m (acetic acid) = 9 g.
Find: ω (acetic acid) -?
Decision.
Let’s find the mass fraction of the dissolved substance (acetic acid):
ω (acetic acid) = m (acetic acid) / m (solution) = 9 g: 300 g = 0.03, or 3%.
Answer: 3%.

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