Question

1. Calculate the molecular masses
of H,, 0, CI, CO,, CH, C,H.
CH, NH,, CH,OH.
Calculate the formula unit
masses of ZnO, Na,O, K,CO
gwen atomic masses of Zn= 65 u,
Na = 23 u, K = 39 u, C = 12 u,
and 0 = 16 u.​

Answer 1

Answer:

a

2

O,K

2

CO

3

.

(atomic masses of Zn=65u,Na=23u,K=39u,C=12u and O=16u)

Share

Study later

ANSWER

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

- The formula unit mass of

(i) ZnO = 65 u + 16 u = 81 u

(ii) Na2O = (23 u x 2) + 16 u = 46 u + 16 u = 62 u

(iii) K2C03 = (39 u x 2) + 12 u + 16 u x 3

= 78 u + 12 u + 48 u = 138 u