Question

What is the mass in grams of 5.0×1020 molecules of aspirin (C9H8O4) ?

Answer 1

What is the mass in grams of 5.0×1020 molecules of aspirin (C9H8O4)?

**Solution.**

$$\mathrm{N}/\mathrm{N}_{\mathrm{A}} = \mathrm{m}/\mathrm{M}$$ $$\mathrm{m} = \mathrm{NM}/\mathrm{N}_{\mathrm{A}} = 9 \times 10^{22} / 6.02 \times 10^{23} = 0.15\ \mathrm{g}$$

**Answer. 0.15 g**

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