1g mole of which pair weighs equal?
Correct answer: D. N2 and CO
- A. NO2 and CO2
- B. Na and NH3
- C. CH4 and O2
- D. N2 and CO
Explanation
Two 1g mol molecules having the same weight means that they will have the same molecular mass. The only pair having the same molecular mass is N2 and CO as Mr of N2 = 14 x 2 = 28 Mr of CO = 12 + 16 = 28.
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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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