A polymer of empirical formula CH2 has molar mass of 28000 gmol-1. Its molecular formula will be
Correct answer: D. 2000 times that of its empirical formula
- A. 100 times that of its empirical formula
- B. 200 times that of its empirical formula
- C. 500 times that of its empirical formula
- D. 2000 times that of its empirical formula
Explanation
The empirical mass of CH4 is 12+2=14g. Dividing molar mass by observed mass will give us the answer: 28000/14=2000 times. As it is numerical, it can have only one possible answer.
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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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