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b. 98
c. 74
d. 122,5
2. a. Na2B4O7---> 2NaBO2 + B2O3
b. 2 KPO4 + 3 MgCl2 ----> 6 KCl + Mg3(PO4)2
c. 3H2SO4 + 2Al(OH) ----> Al2(SO4)3 + 6H2O
d. 2 N2O5---> 4 NO2 + O2