9. Masa soli zawarta w 300 g 5-procentowego roztworu wynosi:
a) 2,5 g; b) 3 g; c) 15 g; d) 30g.
a) 2,5 g; b) 3 g; c) 15 g; d) 30g.
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300g---100%
xg----5%
x=15 g
Odp. C