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se dizolva 7 g sare in apa si se obtin 35 g solutie.care este concentratia


acesteia


Răspuns :

[tex]C \% = \frac{m_{d} }{m_{s}} \times 100[/tex]

[tex]C\% = \frac{7g}{35g} \times 100[/tex]

[tex]C\% = \frac{1}{5} \times 100[/tex]

[tex]C\% = \frac{1 \times 100}{5} [/tex]

[tex]C\% = \frac{100}{5} [/tex]

[tex]C\% = 20\%[/tex]