a) mCaS=40u+32u=72u
b) mAlCl3=27u+3*35,5u=133,5u
c) mK2CO3=2*39u+12u+3*16u=138u
d) mBa(OH)2=137u+2*16u+2*1u=171u
e) mFe3(PO4)2=3*56u+2*31u+8*16u=358u
