What is the density of a mixture of 90% air (density air 1.20 kg/m3) and 10% helium (density of 0.180 kg/m3) ?
A) 0.680 kg/m3
B) 0.750 kg/m3
C) 0.980 kg/m3
D) 1.098 kg/m3
E) 1.103 kg/m3
Correct Answer:
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