Question

1. Calculate the molecular masses of

A. C₂H₂

B. N₂H₄

C. Na₂O

D. O₃

E. pH₃

F. CO₂

G. C₃H_gO

2. Calculate the density of the following

A. 93.6g occupying 15mL

B. 0.992g occupying 1,005mL

C. 13.7g occupying 11.4mL

D. 16.8g occupying 3.19mL.

Answer 1

1) A. (12×2)+ 2= 26

B. 14× 2+ 4 = 32

C. 23× 2 + 16= 62

D. 16 × 3 = 48

E. 31+ 3= 34

F. 12+ 32= 44

G.12 × 3 + 9 + 16= 61

2) density, $D = M/ v$

A. 93.6/ 15= 5.85g/cm3

B. 0.993/ 1005= 0.000985 g/cm3

C. 13.7/11.4= 1.2017g/cm3

D.16.8/ 3.19 = 5.264g/cm3