Use Ideal Gas Law
"PV=nRT"
"V= 15.44 dm^3(\\frac{1 m^3}{1000 dm3})= 15.44\\times 10^{-3}m^3"
"T(K) = 273+42=315K"
"P=\\frac{nRT}{V}=\\frac{6.73\\times 8.314\\times 315 }{15.44\\times 10^{-3}}=1141533 Pa = 1141kPa = 1140kPa" (3 s.f.)
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