Question

a solution is prepared by dissolving certain amount of solute in 500g of water the percentage by msss of solute in solution is 2.38 calculate mass of solute

Answer 1

ʜᴇʟʟᴏ ᴍᴀᴛᴇ!

Mass of solvent = 500g

Mass of solute= ( needed to be find out )

Mass by mass percentage = 2.38%

Mass by mass percentage = Mass of solute / mass of solution × 100

Mass of solution = solute + solvent
( 500g + solute )

( solute ) / ( 500 + solute ) × 100 = 2.38

100solute = 2.38 ( 500 + solute )

100solute = 1190 + 2.38 solute

97.62 solute = 1190

Solute= 12.2g

Hope it helps

Answer 2

Bonjour!

Given---›
Mass of solvent = 500 g
Mass percentage of solute = 2.38%

To find---›
Mass of solute = 'x'

Mass percentage of solute = $\frac{mass \: of \: solute}{mass \: of \: solution} \times 100$

Mass of solution = Mass of solute + Mass of solvent

Therefore,

$mass \: percentage \: of \: solute = \frac{mass \: of \: solute}{mass \: of \: solute \: + mass \: of \: solvent} \times 100$

$= > 2.38 = \frac{x}{x + 500} \times 100 \\ \\ = > 2.38x + 1190 = 100x \\ \\ = > 100x - 2.38x = 1190 \\ \\ = > 97.62x = 1190 \\ \\ = > x = \frac{1190}{97.62} \\ \\ = > x = 12.19 \: g$

So, mass of solute is = 12.19 g

Hope this helps...:)