The number of molecules in 5.6 dm3 of oxygen under STP conditions is:
Correct answer: A. 1.5 x 10^23
- A. 1.5 x 10^23
- B. 1.34 x 10^22
- C. 3.01 x 10^23
- D. 3.01 x 10^22
Explanation
At STP (Standard Temperature and Pressure), 1 mole of any gas occupies 22.4 dm3. So, 5.6 dm3 of oxygen under STP conditions is equivalent to 5.6/22.4 = 0.25 moles of oxygen. The number of molecules in 0.25 moles of oxygen is: 0.25 moles X 6.022 x 1023 molecules/mole = 1.505 x 1023molecules.
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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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