Рассчитайте количества веществ:
1) m(CaO) = 11,2 г;
2) m(K2SO4) = 87 г;
3) m(MgCl2) = 9,5 г;
4) V(O2) = 8,96 л;
5) V(NH3) = 6,72 л.
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