Mr(Na2CO3) = 23*2+12+16*3=106
Mr(Ca3(PO4)2)=40*3+31*2+16*8=310
Mr(CuCl2)=64+35,5*2=135
Mr(H2SO4)=1*2+32+16*4=98
Mr(P2O5)= 31*2+16*5=142
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Mr(Na2CO3) = 23*2+12+16*3=106
Mr(Ca3(PO4)2)=40*3+31*2+16*8=310
Mr(CuCl2)=64+35,5*2=135
Mr(H2SO4)=1*2+32+16*4=98
Mr(P2O5)= 31*2+16*5=142