Question

A compound has an empirical formula of CH2. It has a molecular mass of 56.1. What is the molecular formula?

Accepted Answer

Step 1: We can start solving this problem using the molecular mass of CH2.
For CH2
   C =12.011 g/mole
+ H = 1.008 g/mol x 2
-------------------------
     14.027 g/mole
Step 2. Get the ratio of the empirical mass and the molecular mass.
= 56.1/14.027
= 3.999 = 4

Step 3. Multiply the resulting number with the subscripts of the empirical formula.
4(CH2) = C4H8
The molecular formula is C4H8.

Answer

An empirical formula is the simplest ratio of elements in a molecular formula. CH2 is an empirical formula for methane and other hydrocarbon compound. Think of your compound as "C_nH_2n" .
Find the mass of CH2. 
(12.01"g" xx 1) + (1.008"g" xx 2) = 14.026"g"
Divide this mass into your molecular formula's mass.
(56.1"g")/(14.026"g") = 3.999 ~~ 4
Multiply this value with your empirical formula.
(4 xx 1"C") + (4 xx 2"H") = "C_4H_8"

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Molecular Formula Of Ch2

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