In 120 g of water, 80 g of salt was dissolved. What is the mass fraction of the resulting solution?

Determine the mass of the resulting solution.
m (solution) = m (water) + m (salt) = 120 g + 80 g = 200 g.
Mass fraction of salt in solution.
W (salt) = m (salt) / m (solution) • 100% = 80 g / 200 g • 100% = 40%.

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