If a compound contains 24 gram of carbon 2 gram of hydrogen and 64 gram of oxygen then its empirical formula will be________?
Correct answer: D. CHO2
- A. C2H2O4
- B. CH2
- C. CH2O
- D. CHO2
Explanation
Convert each mass to moles: carbon = 24 g ÷ 12 g mol^-1 = 2 mol, hydrogen = 2 g ÷ 1 g mol^-1 = 2 mol, and oxygen = 64 g ÷ 16 g mol^-1 = 4 mol. Dividing by the smallest value gives the ratio 1:1:2, so the empirical formula is CHO2. The likely wrong choice is C2H2O4, which has the same composition but is not in the simplest whole-number ratio.
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About Moles and Avogadro's Number
The mole connects the microscopic number of particles with measurable mass, using Avogadro's number, 6.022 × 10²³ particles per mole. Questions involve molar mass, conversion between mass, moles and particles, percentage composition, empirical and molecular formulas, and distinguishing atoms, molecules, ions and formula units.
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