Lesson: Chapter 7 — Quantification of Elements and Compounds

7.3. The Avogadro constant 3 of 6 Reset answers

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Question 3

What mass must be weighed out to obtain 6.022 × 10²³ molecules of carbon dioxide? (M_r: CO₂ = 44)

A 44 g B 88 g C 12 g D 16 g

The right answer is the one marked above.

44 g. The relative molecular mass of any substance taken in grams contains the same number of molecules.

12 g and 16 g are the values for carbon and oxygen atoms — the question is about the whole CO₂ molecule.

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