Given:
[tex]mass_{solute} = 70 \: g[/tex]
[tex]mass_{solution} = 280 \: g[/tex]
Required:
[tex]\% \: by \: mass[/tex]
Equation:
[tex]\% \: by \: mass = \frac{mass_{solute}}{mass_{solution}} \times 100[/tex]
Solution:
[tex]\% \: by \: mass = \frac{70 \: g}{280 \: g} \times 100[/tex]
Answer:
[tex]\% \: by \: mass = 25\%[/tex]
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