The mass fraction of salt in a solution obtained by dissolving 45 g of salt in 255 g of water is equal to ..

univerkov | December 7, 2020 | education

Given:
m (salt) = 45g
m (H2O) = 255g
To find:
w (salt) =?
Decision:
m (solution) = m (salt) + m (H2O) = 45g + 255g = 300g
w (salt) = (m (salt) / m (solution)) * 100% = (45g / 300g) * 100% = 15%
Answer: 15%

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