Question

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


acesteia

Answer 1

$C \% = \frac{m_{d} }{m_{s}} \times 100$

$C\% = \frac{7g}{35g} \times 100$

$C\% = \frac{1}{5} \times 100$

$C\% = \frac{1 \times 100}{5}$

$C\% = \frac{100}{5}$

$C\% = 20\%$