A 28.0 L tank contains 0.260 kg of helium at 15.0 ∘C. The molar mass of helium is 4.00g/mol.

How many moles of helium are in the tank?
Express your answer using three significant figures.

What is the pressure in the tank (in pascals)?
Express your answer using three significant figures.

What is the pressure in the tank (in atmospheres)?
Express your answer using three significant figures.