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K3PO4=3*39u+31u+4*16u=212u
Al2(CO3)3=2*27u+3*12u+9*16u=234u
K3PO4 - 39*3+31+4*16=117+31+64=212u
Al2(CO3)3= 2*27+(12+16*3)*3=54+(12+48)*3=180+54=234u