Question

In: Chemistry

Methyl orange, the dye, has a percent composition, by mass, of 51.42% C, 4.31% H, 12.83%...

Methyl orange, the dye, has a percent composition, by mass, of 51.42% C, 4.31% H, 12.83% N, 9.79% S, 7.03% Na, and the remainder is oxygen. The molecular mass of methyl orange is 327.3 u. What is the molecular formula of methyl orange?

Expert Solution

O% = 100-(C%+H%+N%+S%+Na%)

= 100-(51.42+4.31 +12.83+9.79+7.03)

= 14.62%

Element % A.Wt relative number simple ratio

C 51.42 12 51.42/12 = 4.285 4.285/0.305 = 14

H 4.31 1 4.31/1 = 4.31 4.31/0.305 = 14

N 12.83 14 12.83/14 = 0.916 0.916/0.305 = 3

S 9.79 32 9.79/32 = 0.305 0.305/0.305 = 1

Na 7.03 23 7.03/23 = 0.305 0.305/0.305 = 1

O 14.62 16 14.62/16 = 0.914 0.914/0.305 = 3

Empirical formula = C14H14N3SNaO3

E.F.Wt = 327

molecular formula = (empirical formula)n

n = M.Wt/E.F.Wt

= 327.3/327 = 1

molecular formula = C14H14N3SNaO3

queen_honey_blossom answered 2 years ago

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