(单选题)16: 体积为V = 1.20 × 10 - 2 m 3的容器中储有氧气,其压强为 p = 8.31×105 Pa ,温度为T = 300 K该气体的单位体积的分子数为n,该气体的内能为U则有:
A: n = 4.00 × 10 26 m - 3 ;U = 2.49 × 10 4 J
B: n = 2.00 × 10 26 m - 3 ;U = 2.49 × 10 4 J
C: n = 2.00 × 10 26 m - 3 ;U = 2.49 × 10 14 J
D: n = 4.00 × 10 26 m - 3 ;U = 2.49 × 10 14 J
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