Question

De calculat Mr K2M4O4, H3PO4, AlCl3, Fe3O4

Answer 1

Mr(H3PO4)=Ar(H)*3+Ar(P)+Ar(O)*4=1*3+31+16*4=3+31+64=34+64=98
Mr(AlCl3)=Ar(Al)+Ar(Cl)*3=27+35*3=27+105=132
Mr(Fe3O4)=Ar(Fe)*3+Ar(O)*4=56*3+16*4=168+64=232
Mr(K2M4O4)=Ar(K)*2+Ar(M)*4+Ar(O)*4