The relative atomic mass of oxygen is 16 amu. What is the mass of 2 mole of oxygen gas?
Correct answer: A. 64 g
- A. 64 g
- B. 100 g
- C. 32 g
- D. 71 g
Explanation
Option A is correct.The relative atomic mass of oxygen is 16 amu, which means that one mole of oxygen atoms has a mass of 16 grams. However, since we are dealing with oxygen gas (O2) in this question, we need to use the molar mass of oxygen gas to calculate the mass of 2 moles of oxygen gas.The molar mass of oxygen gas is approximately 32 grams per mole (2 x 16 g/mol), so the mass of 2 moles of oxygen gas would be:2 moles x 32 g/mol = 64 gramsTherefore, the mass of 2 moles of oxygen gas is 64 grams.
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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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