CHEMISTRY QUESTION!!! please help....+10 for best answer
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CHEMISTRY QUESTION!!! please help....+10 for best answer

[From: ] [author: ] [Date: 11-08-09] [Hit: ]
..PLEASE answer with full method details...thank you.......
This questions came under gas laws lesson....
Please answer them....

The density of Hg is 0.1784 kg/m^3 at STP. If a given mass of He at STP is allowed to expand to 1.5 times its initial volume by changing the temperature and pressure, compute it's resultant density

PS: m^3 symbolizes metric cube...

PLEASE answer with full method details...
thank you...
best and quickest answer will get +10 for sure.. xD

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The density of helium is 0.1784 g/L. Therefore, I'm guessing you mean He, and not Hg.

D = m / V
If the volume increases by a factor of 1.5, the D will decrease by a factor of 1.5. The mass will remain constant, m = VD.
V1D1 = V2D2
D2 = V1D1 / V2
D2 = (1) (0.1784 g/L) / (1.5) = 0.1189 g/L .... or ..... 0.1189 kg/m^3
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