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30%
20% 15g
To jest taki krzyżyk i tam powinny być szczałki.
m45%\m20% = 2\3
2------x
3-----120g
x = 80g
Odp: Należy dodać 80g roztworu HNO3.
2. 30% 22,5g
22,5%
0% 7,8g
m30%\m0% = 22,5\7,8
22,5-------150g
7,8-------- xg
x = 52g