Thank you for the opportunity to help you with your question!
for (a) you use the ideal gas law PV=nRT=NRT/Na where N is the number of molecules
1 atm = 101,325 Pa , V = 2.6 cm3 = 2.6*10^(-6) m3 , T=293 K
for (b) using the formula n=PV/(RT), you find n=3.20*10^(-20) moles
Hope it helps !!!
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