Homework Help: Chemistry

Posted by joe on Wednesday, November 17, 2010 at 6:57am.

A. ) A goodyear blimp typically contains 5400 m cubed of helium at an absolute pressure of 1.1*10^5 Pa. The temperature of the helium is 280 K. What is the mass (in kg) of the helium of the blimp?

B. ) Estimate the spacing between the centers of neighboring atoms in a piece of solid aluminum, based on knowledge of the density (2700 kg/m^3) and atommic mass (26.9815 u) of aluminum.

Chemistry - Dr Russ, Wednesday, November 17, 2010 at 8:01am
a) use PV=nRT to find n, the number of moles of He. The Molar mass of He=4 g mol^-1. Hence the mass (g) is 4xn. then convert to kg.
Chemistry - Anonymous, Tuesday, January 15, 2013 at 8:51pm
the mass of aluminum cup

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