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Please solve c and d A container in the shape of a cube 8.4 cm on...

Please solve c and d

A container in the shape of a cube 8.4 cm on each edge contains air (with equivalent molar mass 28.9 g/mol) at atmospheric pressure and temperature 306 K.
(a) Find the mass of the gas. (I did this already and got 6.82e-4 kg its correct)

(b) Find the gravitational force exerted on it. (I did this already and got 6.69 mN its correct)

(c) Find the force it exerts on each face of the cube. (kN)

(d) Why does such a small sample exert such a great force?

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