Ответ:
1) m= m(Al2O3)/w *100%
m=300г / 25% * 100% = 1200г
2) m= m(NaOH) /w * 100%
m= 30 /20 * 100 = 150г
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Ответ:
1) m= m(Al2O3)/w *100%
m=300г / 25% * 100% = 1200г
2) m= m(NaOH) /w * 100%
m= 30 /20 * 100 = 150г