A 21  L reaction vessel contains only containts He gas. The system is kept at 45 ∘C and the pressure inside the vessel is found to be 0.435 atm. a) Find the number of moles of He in the reaction vessel. b find the number of molecules

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A 21  L reaction vessel contains only containts He gas. The system is kept at 45 ∘C and the pressure inside the vessel is found to be 0.435 atm.

a) Find the number of moles of He in the reaction vessel.

b find the number of molecules 

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