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Uollis
@Uollis
July 2022
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Определите общее число атомов, входящих в состав формулы каждого вещества: PbS, CaSO3, My(OH)2, Ca3(PO4)2, Fe2(SO4)3.
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Oleksandra200303
Mr( PbS ) = Ar(Pb) + Ar(S) = 85 + 32 = 117
Mr( CaSO3) = Ar(Ca) + Ar(S) +3× Ar(O) = 40+32+3×16=72+48=120
Mr( Mg(OH)2) = Ar(Mg) + 2×(Ar(O)+Ar(H))= 24+2×(16+1)= 24+34=58
Mr( Ca3(PO4)2) = 3×Ar(Ca)+2×(Ar(P)+4×Ar(O)) = 3×40+2×(31+4×16) = 120+128 = 248
Mr(Fe2(SO4)3 = 2×Ar(Fe)+3×(Ar(S)+4×Ar(O)) = 2×56+3×(32+4×16) = 112+3×96 = 112+288 = 400
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Answers & Comments
Mr( CaSO3) = Ar(Ca) + Ar(S) +3× Ar(O) = 40+32+3×16=72+48=120
Mr( Mg(OH)2) = Ar(Mg) + 2×(Ar(O)+Ar(H))= 24+2×(16+1)= 24+34=58
Mr( Ca3(PO4)2) = 3×Ar(Ca)+2×(Ar(P)+4×Ar(O)) = 3×40+2×(31+4×16) = 120+128 = 248
Mr(Fe2(SO4)3 = 2×Ar(Fe)+3×(Ar(S)+4×Ar(O)) = 2×56+3×(32+4×16) = 112+3×96 = 112+288 = 400