Question

An organic compound has an empirical formula of CH2O and had an approximate molecular weight of 117. What is its molecular formula?​

Answer 1

Empirical formula

= CH

2

O

Empirical formula mass

= 12g/mol + 2 g/mol + 16 g/mol = 30 g/mol

Molecular formula mass

Empirical formula mass

=

60 g/mol

30 g/mol

=

2

Explanation:

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Answer 2

GIVEN:

• Empirical formula =CH2 O
• Molecular weight = 117 g

TO FIND

• Molecular formula

SOLUTION:

$empirical \: mass \: = 12 + 2 + 16$

$empirical \: mass \: = 30g$

$molecular \: weight \: = 117g$

As per the formula,

$molecular \: weight \: = n \: \times empirical \: mass$

$n = \frac{117}{30}$

$n = 4$

molecular formula =4(CH2 O)

molecular formula =C 4 H 8 O4