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2014-09-01T13:33:06+03:00
O2 = 2*16 = 32 
H2SO4 = 2+32+4*16 = 98 
H2O = 2+16 = 18 
Al2(SO4)3 = 2*27+3*(32+4*16) = 342 
Cu(OH)2 = 64+2*(1+16) = 98 
Cr2O3 = 2*52+3*16 = 152
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