The maximum number of molecules are present in:
Correct answer: C. 1.5 g of H2gas.
- A. 15 dm3 of H2 gas at STP.
- B. 5 dm3 of N2gas at STP.
- C. 1.5 g of H2gas.
- D. 5 g of O2gas.
Explanation
1 mole of H2 gas = 22.4 dm3 =6.022 x 1023 molecules n (moles) = mass in g/mr = 1.5/2 = 0.75 mol 1 mol : 6.022 x 10 23 0. 75 mol : x x= (0.75 x 6.022 x1023) =4.51 x 1023 molecules As shown by all of the calculations above, 1.5 g of H2 gas has the most 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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