Ideal gas law?
18.7 L N2 at 25 °C and 125 kPa and 44.3 L O2 at 25 °C and 125 kPa were transferred to a tank with a volume of 6.00 L. What is the total pressure at 51 °C?
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Notice that the pressure and temperature of the two gases are equal. So:
(125 kPa) x (51 + 273) K / (25 + 273) K x (18.7 L + 44.3 L) / (6.00 L) = 1427 kPa