Ответ:
Mr (K2SO4)= 39*2+32+16*4= 78+32+64= 174
Mr (BaCl2)= 137+35*2=137+70= 207
Mr (Fe2(SO4)3)= 56*2+32*3+16*12= 112+96+192=400
Mr (H2SO3)= 2*1+32+16*3= 2+32+48=32+50=82
Mr(P2O3)= 31*2+16*3= 62+48= 110
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Ответ:
Mr (K2SO4)= 39*2+32+16*4= 78+32+64= 174
Mr (BaCl2)= 137+35*2=137+70= 207
Mr (Fe2(SO4)3)= 56*2+32*3+16*12= 112+96+192=400
Mr (H2SO3)= 2*1+32+16*3= 2+32+48=32+50=82
Mr(P2O3)= 31*2+16*3= 62+48= 110