Sue dissolved a certain amount of salt in 400 grams of water to obtain 405 grams of salt solution. What was the mass of the salt used to make the solution?
2 answers:
Sue has 400 grams of water to start with, then she dissolves salt into the water. Ending with 405 grams of mixture this means she added 5 grams of salt. 5 grams.
The answer would be 5 grams of salt
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