Whats is the density of air?
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A student collected data about the density of air. She found that .1 g of air had a volume of 100 cm3(squared). What is the density of the air? A. .001 g/cm3 B. .01 g/cm C. .1 g/cm3 D. 1.0 g/cm3 Could you teach me how to find the density? Does the same formula apply like "mass divided volume"? i really need the answer quick
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Answer:
Molecular weight of air = (80*28) + (20*32) / 100 = 28.8 We take 80 % of N2 and 20 % of O2. (Not correct but very near). One mole of a gas = 22.4 dm³ (OK, at O°C and 1 atm). So the density of air is 28,8 / 22,4 = 1.28 g / dcm³ = 0.00128 g / cm³. As your student found 0.1 g for 100 cm³, the answer is of course A. In reality it also is A, which is the nearest to the theory. We have calculated it but not really in a correct way. Remember it is not exactly 80-20 and is it at O°C and 1 atm ?
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Other answers
B
Haris K
D. 1.0 g/cm3 This is the density of air at sea-level under standard atmospheric pressure of 191.325 kpa. Density = mass/volume such as grams per milliliter,
davehuckleberry_55
A .1g divided by 100cm3 = .oo1g/cm3
Love112
A for sure :]
alex.
do yo own homework boy!
Rudolf
its a
josh...
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