74g of calcium hydroxide will yield OH- ions:
Correct answer: B. 34g
- A. 17g
- B. 34g
- C. 51g
- D. 40g
Explanation
mole= given mass in gram/molar mass Mole of calcium hydroxide = 74/74 = 1 mole OH- mass in Ca(OH-)2 = (17)2 = 34 OH- ions = 1 x 34 = 34g answer!
This question appeared on the ETEA MDCAT 2008 paper, which you can sit online with every answer explained.
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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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