Lesson: Chapter 7 — Quantification of Elements and Compounds

Working with moles 10 of 10 Reset answers

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Question 10

How many moles of oxygen atoms are contained in one mole of barium phosphate (Ba₃(PO₄)₂)?

A 6 B 2 C 4 D 8

The right answer is the one marked above.

8. There are 4 oxygens inside the bracket and the 2 outside acts on them: 4 × 2 = 8.

4 comes from ignoring the 2 outside the bracket. Where there is a bracket, the number outside acts on every atom inside it.

Answer the question to continue.