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A compound with the empirical formula CH20 was found to have a molar mass between 89g and 91g. What is the molecular formula of the compound?

2 Answers

3 votes

Answer:

The molecular formula of the compound =
C_3H_(6)O_3

Step-by-step explanation:

Given, The empirical formula is =
CH_2O

Molecular formulas is the actual number of atoms of each element in the compound while empirical formulas is the simplest or reduced ratio of the elements in the compound.

Thus,

Molecular mass = n × Empirical mass

Where, n is any positive number from 1, 2, 3...

Mass from the Empirical formula = 12 + 2×1 + 16 = 30 g/mol

Also, given that:-

89 g/mol < Molar mass > 91 g/mol

So,

Molecular mass = n × Empirical mass

89 g/mol < 30 n > 91 g/mol

⇒ n ≅ 3

The molecular formula of the compound =
C_3H_(6)O_3

User Sagar Modi
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2 votes
The molar mass of the Formaldehyde is about 30 gram per mol which means it goes like 90/30 =3.
So, the molecular formula would be 3 times the empirical formula. C3H6O3.
User Eugene To
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7.7k points