A polymer of empirical formula CH2 has a molar mass of 28000gmol-I. What is its molecular formula?
Correct answer: B. (CH2)2000
- A. (CH2)1400
- B. (CH2)2000
- C. (CH2)2800
- D. (CH2)2500
Explanation
The compound must have a molecular formula of 28000. Mr (CH2)2000 = (12+2) x 2000 = 28000 Hence, option B is correct.Another way of solving this problem is shown below:
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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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