Compared to air, the density of an 80% He and 20% O2 mixture is about which of the following?
a. Two-thirds as much
b. One-half as much
c. One-third as much
d. One-fifth as much
ANS: C
Although air has a density of 1.293 g/L, the density of an 80% helium mixture is 0.429 g/L.
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