Question

Calculate the molecular masses of ferric chloride,lead nitrate,sodium carbonate,
hydrogen chloride and ammonium phosphate

Answer 1

Dear student,
Atomic mass of Fe= 56 u ; Cl= 35.5u ; Pb= 207u ;N =14u ; O=16u ; Na=23u ;C= 12u ;H= 1u ; P= 31 u .

Molecule Name	Constituent in molecule	Molecular mass
Ferric chloride :FeCl3	1 Fe , 3 Cl	56 + 3*35.5 = 162.5 u
lead nitrate :Pb(NO3)2	1 Pb , 2 N , 6 O	207 + 2*14 + 6*16 = 331u
Sodium carbonate : Na2CO3	2 Na , 1 C , 3 O	23*2 + 12 + 3*16 = 106 u
Hydrogen chloride : HCl	1 H , 1 Cl	1 + 35.5 = 36.5 u
Ammonium phosphate : (NH4)3PO4	3 N , 12 H , 1 P , 4 O	3*14 + 12*1 + 31 +4*16 =149 u

Regards