How many moles are in 22.2 grams of Calcium chloride, CaCl2?
Correct answer: A. 0.2 moles
- A. 0.2 moles
- B. 0.3 moles
- C. 0.4 moles
- D. 0.5 moles
Explanation
The molar mass of CaCl2 is 40.0 g/mol + 2 x 35.5 g/mol = 111.0 g/mol, so moles = 22.2 g / 111.0 g/mol = 0.20 mol. Students may choose 0.3 mol by dividing by the atomic mass of calcium alone instead of the formula-unit mass of CaCl2.
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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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