What is the % by mass of 2.5 of salt is dissolve in 250g of water?
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mass percent is number of grams of solute dissolved in 100 g of solvent.
2.5 g of salt dissolved in 250 g of water.
So
1 g of salt dissolved in 100 g of water (solvent)
=>
so mass percent = 1%
Mass percent = (mass solute/mass solution)*100 = ?
mass solute = 2.50 grams
mass solution = 250 g solvent + 2.50 g salt = 252.5 g solution.
Then % m/m = (2.50/252.5)*100 = 0.99
I agree with DrBob222's solution.
To calculate the percent by mass of a solute in a solution, you need to divide the mass of the solute by the total mass of the solution and multiply the result by 100.
In this case, the mass of salt (solute) is given as 2.5 grams, and the mass of water is given as 250 grams. Therefore, the total mass of the solution is 250 grams + 2.5 grams = 252.5 grams.
To find the percent by mass, we divide the mass of the solute (2.5 grams) by the total mass of the solution (252.5 grams) and multiply by 100:
(2.5 grams / 252.5 grams) * 100% = 0.990 * 100% = 0.990%
Therefore, the percent by mass of 2.5 grams of salt dissolved in 250 grams of water is approximately 0.990%.