Weight of butane gas in filled cylinder =29−14.8 kg=14.2 kg⇒ During the course of use, the weight of the cylinder reduces to 23.2 kg⇒ Weight of butane gas remaining now =23.2−14.8=8.4 kgAlso, during use, V (cylinder) and T remain same.Therefore, p2​p1​​=n2​n1​​⇒p2​​=(n1​n2​​)p1​=(14.28.4​)×2.5[ Here, n1​n2​​=w1​w2​​]=1.48 atm​Also, the pressure of gas outside the cylinder is 1.0 atm.⇒pV⇒V​=nRT=pnRT​=58(14.2−8.4)×103​×10.082×30​ L=2460 L=2.46 m3​