Question

Calculate the molecular mass/formula unit mass of the following compounds: Na2CO3 HNO3 Ca(OH)2 MgCl2​

Answer 1

Answer:

Explanation:

Formula unit mass of ZnO=(Atomic mass of Zn)+(Atomic mass of O)

                                            =(65+16)u =81u

Formula unit mass of Na  

2

​

O=(2×23)+16

                                             =62u

Formula unit mass of K  

2

​

CO  

3

​

=(2×39)+12+(3×16)

                                                 =138u

Answer 2

Answer:

Correct option is

C

74

Molecular mass of Ca(OH)

2

=1(Atomic mass of Ca)+2(Atomic mass of O) +2(Atomic mass of H)

=40+2(16)+2(1)

=40+32+2

=74