What is the density of a mixture of 40% oxygen (O2) and 60% helium at STPD?
a. 0.34 g/L
b. 0.55 g/L
c. 0.68 g/L
d. 1.25 g/L
ANS: C
For the density of a gas mixture to be calculated, the percentage or fraction of each gas in the mixture must be known. For example, to calculate the density of air at STPD, the following equation is used:
dwair = (FN2 ? gmw N2) + (FO2 ? gmw O2) ÷ 22.4 L
dwair = (0.79 ? 28) + (0.21 ? 32) ÷ 22.4 L
dwair = 1.29 g/L
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