Calculate the mass of table salt required to prepare 800 g of a 40% solution of this salt.
| July 1, 2021 | education
The mass of p – pa salt is 800 g.
W solution – 40%.
We find the mass of salt, for this we use the following formula.
W = mr.w / mr-ra × 100%.
Where W is the mass fraction of salt.
mr.v. – the mass of the soluble substance.
mr-ra is the mass of the solution.
We find the mass of salt.
m r.h. = m solution × W / 100% = 800 g × 40% / 100% = 320 g.
This means that the mass of table salt is 320 grams.
Answer: m (NaCl) = 320 g.
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