Question

what mass of sodium chloride is needed to prepare 670.g of a 4% sodium chloride solution

Answer 1

Answer:

Mass of sodium chloride is needed to prepare 670.g of a 4% sodium chloride solution

26.8 grams

Explanation:

Molar mass = It is the amount of substance present in 1 mole of it.

1 mole of substance = Molar mass in grams .\

% mass = Amount of substance present in 100 gram of the solution

4% means 4 gram salt is present in 100 gram of solution

4% of 670 gram is :

$\frac{4}{100}\times 670$

= 26.8 gram

Hence,Mass of sodium chloride is needed to prepare 670.g of a 4% sodium chloride solution is :

26.8 grams

Note :

Molar mass of NaCl = mass of Na + Mass of Cl

= 22.98 + 35.45

= 58.44 g/mol