How many grams of potassium nitrate should be taken to prepare 120 grams of a 12% solution?

univerkov | February 17, 2021 | education

Given:
m (solution) = 120 g
W (KNO3) = 12%
To find:
m (substances) =?
Decision:
1) W = (m substance: m solution) x 100%
Hence, m substance = (W x m solution): 100%
2) Find the mass of the potassium nitrate substance.
m (KNO3) = (12% x 120 g): 100% = 14.4 g.
Answer: m substance (KNO3) = 14.4 g.

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