SATHEE: Some Basic Concepts Of Chemistry Question 143

Some Basic Concepts Of Chemistry Question 143

Question: The empirical formula of a compound composed of 38.4% potassium, 36.3% oxygen, 23.7% carbon and 1.66% hydrogen is determined to be

Options:

A) $K C_{2} H_{5} O_{4}$

B) $K_{3} C_{6} H_{5} O_{7}$

C) $K_{2} C H O_{3}$

D) $K_{6} C_{4} H_{5} O_{7}$

Show Answer

Answer:

Correct Answer: B

Solution:

[b] Element %by mass Atomic mass Rel.no.of moles of element Simplest molar ratio K 38.4 39.10 $\frac{38.4}{39.10} = 0.982$ $\frac{0.982}{0.982} = 1$ O 36.3 16.00 $\frac{36.3}{16.00} = 2.27$ $\frac{2.27}{0.982} = 2.3$ C 23.7 12.01 $\frac{23.7}{12.01} = 1.97$ $\frac{1.97}{0.982} = 2.00$ H 1.66 1 1.01 $\frac{1.66}{1.01} = 1.64$ $\frac{1.64}{0.982} = 1.67$ In this case fractions are in thirds so a factor of 3 will change Simple molar ratio Fraction nearest decimal value Nearest factor Whole no. mole ratio 1.00 mol K 1 mol K $\times 3$ 3 mol K 2.31 mol O 2 1/3 mol O $\times 3$ 7 mol O 2.01 mol C 2 mol C $\times 3$ 6 mol C 1.67 mol 4 1 2/3 mol H $\times 3$ 5 mol H Hence empirical formula is $K_{3} C_{6} H_{5} O_{7}$ which is formula of potassium citrate.

Some Basic Concepts Of Chemistry Question 143

Question: The empirical formula of a compound composed of 38.4% potassium, 36.3% oxygen, 23.7% carbon and 1.66% hydrogen is determined to be

Options:

Answer:

Solution:

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Some Basic Concepts Of Chemistry Question 143

Question: The empirical formula of a compound composed of 38.4% potassium, 36.3% oxygen, 23.7% carbon and 1.66% hydrogen is determined to be

Options:

Answer:

Solution:

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

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