Mr(H2SO4) = 2Ar(H)+Ar(S)+4Ar(O) = 2*1+32+4*16 = 98 ω(Э)=[m(Э)/M(в-ва)]*100% ω(H) = 2/98*100= 2,04% ω(S) = 32/98*100 = 32,65% ω(O) = 64/98*100 = 65,31%