Question

Consider a 790-mL container at 21 °C in which the pressure of argon is 1.98x106 Pa.

a) What mass of argon (in g) is present in this container?
b) How many molecules is this?
a) Use PV = nRT, solve for n
n = grams/molar mass, solve for grams.

b) 1 mole contains 6.022 x 10^23 molecules. How many moles do you have?
WHich (R) do I have to use

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