Question

A compound was determined to have the simplest formula CH2. If the molecular weight of the compound is 70 u, what is the molecular formula of the compound? 1. C5H10 2. C10H5 3. C4H22 4. C4H8

Answer 1

Answer:

The answer to your question is letter A

Explanation:

Data

Empirical formula CH₂

Molecular weight = 70 u

Process

1.- Calculate the molecular weight of the empirical formula (CH₂)

CH₂ = (12 x 1) + (1 x 2) = 12 + 2 = 14 g

2.- Divide the molecular weight by the molecular weight of the empirical formula

                      70/14 = 5

3.- Write the empirical formula

                       5(C₁H₂) = C₅H₁₀

Answer 2

1. C₅H₁₀

Given:

Empirical formula = CH₂

Molecular weight = 70 u

To find Molecular formula of the compound:

1.- Calculate the molecular weight of the empirical formula (CH₂)

CH₂ = $(12 * 1)+(1*2)=12+2=14 u$

(As molecular weight of C=12u and H= 1u)

2.- Divide the molecular weight by the molecular weight of the empirical formula

$\frac{\text{Molecular weight}}{\text{ Molecular weight of Empirical formula}} = \frac{70}{14} =5$

3.- Write the empirical formula

5(C₁H₂) = C₅H₁₀

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