400cm³ of Q was collected at 25⁰C and 1.20x10⁵Nm⁻², calculate the volume it would occupy at stp and the number of molecules of Q present. (standard pressure = 1.0 x 10⁵ Nm⁻², Avogadro's constant = 6.02x10²³, 1 mole of gas occupies 22.4dm³ at stp)
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