11.207 dm3 of methane (CH4) at STP has_moles of hydrogen atoms:
Correct answer: C. 2
- A. 4
- B. 8
- C. 2
- D. 16
Explanation
The molar volume of a gas at STP is 22.4 dm3/mol.Given:Volume of methane (V) = 11.207 dm3Molar volume at STP (Vm) = 22.4 dm3/molUsing the formula:n = V / Vmn = 11.207 dm3 / 22.4 dm3/moln = 0.5 molThe number of moles of hydrogen atoms is equal to: 0.5 mol × 4 (hydrogen atoms per methane molecule) = 2 mol.Thus, the calculation demonstrates that 11.207 dm3 of methane at STP contains 2 moles of hydrogen atom.
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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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