10 ml of hydrogen contains 2 x 10^3 molecules of hydrogen at a certain pressure and temperature. Calculate the number of molecules of oxygen whose volume is 200 ml at the same temperature and pressure.
Correct answer: B. 4 x 10^4 molecules
- A. 2 x 10^4 molecules
- B. 4 x 10^4 molecules
- C. 4 x 10^2 molecules
- D. None of these options is correct
Explanation
At the same temperature and pressure, equal volume of the gas contains equal number of molecules. Hence, 10 ml of H2 or O2 = 2 x 103 number of molecules 200 ml of H2 or O2 = (2 x 103 / 10) x 200 number of molecules =4 X 104 number of molecules.
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About Fundamental Concepts of Chemistry
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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