The number of moles are present in 9.5g of CS2?
Correct answer: C. 0.125
- A. 1.5
- B. 0.25
- C. 0.125
- D. None of These
Explanation
The molar mass of CS2 is 12 g/mol + (2 x 32 g/mol) = 76 g/mol. Therefore, moles = mass/molar mass = 9.5 g / 76 g/mol = 0.125 mol. The likely mistake is choosing 0.25 mol by using an incorrect molar mass of 38 g/mol or forgetting that CS2 contains two sulfur atoms.
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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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