what is the mass of solute dissolved in 50.0g of a 12.5% saline solution?
I just selcted 4.00g but it was wrong the correct answerr is 6.25g but i do not know how they got that answer.
The answer is 6.25g because 12.5% is the mass percent of the saline solution (aka grams of Salt per 100 grams of water). You set up the problem as 0.125 (or 12.5%)= a certain amount of grams of NaCl divided by 100 grams of water. You multiply 0.125 by 100 and get 12.5 grams of NaCl for every 100 grams of water. However, since the question is asking for the mass of solute (NaCl) per every 50 grams of water, you divide 12.5 grams by 2 (since 100 divided by 2 is 50) and get 6.25 grams of NaCl.
As we have no other information then assume that it is % w/w
Hence mass of solute is
0.125 x 50 g
4.00
4.00g
6.25 is correct
To find the mass of solute in a solution, you need to multiply the mass of the solution by the percentage of the solute.
In this case, we have a 12.5% saline solution and the mass of the solution is 50.0g.
Step 1: Convert the percentage to a decimal: 12.5% = 0.125
Step 2: Multiply the mass of the solution by the decimal representing the percentage:
0.125 x 50.0g = 6.25g
Therefore, the mass of solute dissolved in 50.0g of a 12.5% saline solution is 6.25g.