Question

How many grams of salt are needed to make 745 g of salt water that is 38.5 % salt by mass

Answer 1

Answer:

We need 286.6 grams of salt to make a salt water solution that has a mass % of 38.5 %

Explanation:

Step 1: Data given

Mass of salt water = 745 grams

% salt by mass  = 38.5 %

Step 2: Calculate grams of salt in the solution

Mass of salt = mass % * total mass

Mass of salt = 0.385 * 745 =  286.8 grams salt

This means we need 286.6 grams of salt to make a salt water solution that has a mass % of 38.5 %

Answer 2

The amount of salt needed would be 286.83 grams.

• The salt water is 38.5% salt by mass.

• This means that 38.5 grams of salt would be present in every 100 grams of the solution.

In this case, the mass of the solution is 745 grams. Thus, the equivalent amount of salt that it will contain can be calculated by:

                    38.5 x 745/100

                         = 286.83 grams

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