M Al(OH)3=27 g/mol+3*16 g/mol+3*1 g/mol=78 g/mol
M H3PO4=3*1 g/mol+31 g/mol+4*16 g/mol=98 g/mol
M NH4OH=14 g/mol+5*1 g/mol+16 g/mol=35 g/mol
M Fe(NO3)2=56 g/mol+2*14 g/mol+6*16 g/mol=180 g/mol
M Al2(CO3)3=2*27 g/mol+3*12 g/mol+9*16 g/mol=234 g/mol
M Al2(SO4)3=2*27 g/mol+3*32 g/mol+12*16 g/mol=342 g/mol