The mole fraction of helium in dry air near sea level is 0.00000524 where the molar mass of helium is 4.003. The concentration of helium in the atmosphere is __________ ppm.
A) 1.91 × 1011
B) 5.24 × 10-4
C) 5240
D) 5.24
E) 5.24 × 10-12
Correct Answer:
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