Which of the following statement is wrong?
Correct answer: D. One mole of nitrogen and half a mole of oxygen weigh the same.
- A. One mole of hydrogen weighs less than one mole of glucose.
- B. Two moles of hydrogen and one mole of helium weigh the same.
- C. 0.1 mole of oxygen weighs more than one mole of hydrogen.
- D. One mole of nitrogen and half a mole of oxygen weigh the same.
Explanation
One mole of nitrogen (N2) has a molar mass of 28.01 g/mol, while half a mole of oxygen (O2) has a molar mass of 15.01 g/mol. Therefore, one mole of nitrogen weighs more than half a mole of oxygen.
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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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