STANDARD Chemistry Molar Mass and Molecules MCQ Question
What is the mass of carbon dioxide which contains the same number of molecules as are contained in 40 g of oxygen?
40 g
55 g
32 g
44 g
Correct Answer
Detailed Explanation
The molar mass of O₂ is 32 g/mol. Therefore, 32 g of O₂ contains 6.023 × 10²³ molecules. For 40 g of O₂, the number of molecules is 7.529 × 10²³. The mass of CO₂ containing the same number of molecules is calculated using the molar mass of CO₂ (44 g/mol), resulting in 55 g.
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