Solution contains 85.5g of sucrose (C12H22O11) in 250 cm3. What is its molarity?
Correct answer: A. 1 M
- A. 1 M
- B. 0.5 M
- C. 0.25 M
- D. 2 M
Explanation
Molarity is moles of a substance divided by the volume in liters or cubic decimeters. For moles, divide the given mass with the molar mass of sucrose, which is (12x12+22+11x16) 342 grams per mol. Number of moles is 85.5/342 which comes out to 0.25 mol. To convert 250 cubic cm to liters, divide by 1000, so this comes out to 0.25 liters.Molarity = 0.25/0.25 = 1M so, answer is A.
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Mole calculations connect mass, number of particles and Avogadro's number, while balanced equations provide the mole ratios used in stoichiometry. Questions cover limiting and excess reactants, theoretical yield and percentage yield, including identifying which reactant is consumed first and comparing the actual product with the maximum possible product.
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