A laboratory technician has a sample of aluminum metal and wishes to find the number…

CHEMISTRY · Single correct · A Level · Chemistry · Amount of substance · Amount of substance

Problem

A laboratory technician has a 0.250 g0.250\,\text{g} sample of aluminum metal and wishes to find the number of aluminum atoms present. Which of the following sequences of two conversion factors, applied in order, will correctly complete the calculation? (a) (26.98 mol Al/1 g Al)×(6.022×1023 atoms Al/1 mol Al) (26.98\,\text{mol Al}/1\,\text{g Al}) \times (6.022 \times 10^{23}\,\text{atoms Al}/1\,\text{mol Al}) (b) (1 mol Al/26.98 g Al)×(6.022×1024 atoms Al/1 mol Al) (1\,\text{mol Al}/26.98\,\text{g Al}) \times (6.022 \times 10^{24}\,\text{atoms Al}/1\,\text{mol Al}) (c) (1 mol Al/26.98 g Al)×(6.022×1023 atoms Al/1 mol Al) (1\,\text{mol Al}/26.98\,\text{g Al}) \times (6.022 \times 10^{23}\,\text{atoms Al}/1\,\text{mol Al}) (d) (1 mol Al/13.0 g Al)×(6.022×1023 atoms Al/1 mol Al) (1\,\text{mol Al}/13.0\,\text{g Al}) \times (6.022 \times 10^{23}\,\text{atoms Al}/1\,\text{mol Al})

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