Question

Calculate molecular mass of the following-

a)Oxygen Gas
b)Phosphorus
c)Sulphur
d)Ammonia
e)Acetic Acid
f)Ethyne

Answer 1

Explanation:

a)15.999 u

b)30.973762 u

c)32.065 u

d)17.031 g/mol

e)60.052 g/mol

f)26.04 g/mol

Answer 2

a) Oxygen (diatomic molecule) O₂ = (2 x 16) = 32

b) Phosphorus P = 31

c) Sulphur S = 32

d) Ammonia NH₃ = [ 14 + (1×3)] = 17

e) Acetic Acid CH₃COOH = [ 12 + (1×3) + 12 + 16 + 16 + 1 ] = 60

f) Ethyne (Acetylene) C₂H₂ = [ (12 × 2) + (1 × 2)] = 26