mP2O3=2*31u+3*16u=110 u
mK2O=2*39u+16u=94u
mFeCl2=56u+2*35,5u=127u
mH2SO4=2*1u+32u+4*16u=98u
mCa(OH)2=40u+2*16u+2*1u=74 u
mMgS=24u+32u=56 u