Asked in NUMS 2022 2022Moderate

Percentage composition of mass in CO2 is:

Correct answer: C. 27 .37% carbon & 72.72% Oxygen

  • A. 30.45% Carbon & 69.54% Oxygen
  • B. 24.22% Carbon & 75.78% Oxygen
  • C. 27 .37% carbon & 72.72% Oxygen
  • D. 41.68% Carbon & 58.12% Oxygen

Explanation

The atomic weight of carbon is 12 grams and that of oxygen is 16 grams. Hence we have calculated the mass 5 of carbon in carbon dioxide to be 27.37% and 72.72% oxygen.

Last updated

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.

Practise Fundamental Concepts of Chemistry

894 free Fundamental Concepts of Chemistry MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.

Exams that ask Chemistry questions like this

Chemistry is on 12 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.

Related questions