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# Determine the density of air in grams per liter at a temperature of 20.5 deg. C and a pressure of 755 mmHg.?

Determine the density of air in grams per liter at a temperature of 20.5 deg. C and a pressure of 755 mmHg. Assume that air is approximately 20% O2 and 80% N2 (i.e. the mole fraction of oxygen is 0.20 and the mole fraction of nitrogen is 0.80)

I need the explanation or how to on solving problem like this please! Thank you so much! =)

Update:

Can you explain how you got 1.29 g/L to begin with?

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- HalchemistLv 78 years agoFavorite Answer
? g/L = 1.29 g/L x 755 mm/760 mm x 273 K/ 293.5 K = 1.19 g/L

If the P decreases, so does the density

If the temperature increases the density decreases

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