A sample of urea contains 3.011 × 10²³ nitrogen atoms. The mass of the sample is

A. 30 g

B. 15 g

✓

C. 7.5 g

D. 60 g

📝 Explanation

Urea contains two nitrogen atoms per molecule. Thus 0.5 mol nitrogen atoms correspond to 0.25 mol urea. Mass = 0.25 × 60 = 15 g.

📖 Additional Information

30 g
15 g
7.5 g
60 g

Urea contains two nitrogen atoms per molecule. Thus 0.5 mol nitrogen atoms correspond to 0.25 mol urea. Mass = 0.25 × 60 = 15 g.

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