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1. |
A gas mixture of 40% He and 60% Ne is passed through a diffusion tube, if the amount of He is recovered is 20% of the input, what is the percentage of He in the product? |
A. | 25 % |
B. | 33.3 % |
C. | 50 % |
D. | 66.6 % |
Answer» B. 33.3 % | |