. A 20.0-L tank contains 4.86 * 10-4 kg of helium at
Chapter 18, Problem 18.1(choose chapter or problem)
. A 20.0-L tank contains 4.86 * 10-4 kg of helium at 18.0C. The molar mass of helium is 4.00 g>mol. (a) How many moles of helium are in the tank? (b) What is the pressure in the tank, in pascals and in atmospheres?
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