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【单选题】
苯和甲苯能形成理想溶液。在20°C时,液体苯的饱和蒸气压p1为9960 Pa,液体甲苯的饱和蒸气压p2为2973 Pa。当20°C时,与等摩尔的苯和甲苯的混合液呈平衡的蒸气中苯的物质的量分数y1是:A.
1
B.
0.3
C.
0.23
D.
0.77
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