Question

An organic compound on analysis gave $$C = 54.2\% ,H = 9.2\% $$     by mass. Its empirical formula is

A. $$CH{O_2}$$
B. $$C{H_2}O$$
C. $${C_2}{H_8}O$$
D. $${C_2}{H_4}O$$  
Answer :   $${C_2}{H_4}O$$
Solution :
Element % No. of moles Molar ratio Whole no. ratio
$$C$$ 54.2 $$\frac{{54.2}}{{12}} = 4.5$$ $$\frac{{4.5}}{{2.3}} = 2$$ 2
$$H$$ 9.2 $$\frac{{9.2}}{1} = 9.2$$ $$\frac{{9.2}}{{2.3}} = 4$$ 4
$$O$$ 36.6 $$\frac{{36.6}}{{16}} = 2.3$$ $$\frac{{2.3}}{{2.3}} = 1$$ 1

Empirical formula $$ = {C_2}{H_4}O$$

Releted MCQ Question on
Physical Chemistry >> Some Basic Concepts in Chemistry

Releted Question 1

$$27 g$$  of $$Al$$  will react completely with how many grams of oxygen?

A. $$8\,g$$
B. $$16\,g$$
C. $$32\,g$$
D. $$24\,g$$
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Releted Question 2

A compound was found to contain nitrogen and oxygen in the ratio $$28 gm$$  and $$80 gm$$  respectively. The formula of compound is

A. $$NO$$
B. $${N_2}{O_3}$$
C. $${N_2}{O_5}$$
D. $${N_2}{O_4}$$
View Answer
Releted Question 3

The largest number of molecules is in

A. $$36\,g$$  of water
B. $$28\,g$$  of carbon monoxide
C. $$46\,g$$  of ethyl alcohol
D. $$54\,g$$  of nitrogen pentoxide
View Answer
Releted Question 4

The total number of electrons in one molecule of carbon dioxide is

A. 22
B. 44
C. 66
D. 88
View Answer

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Some Basic Concepts in Chemistry

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