pV = nRT with p in atm, V in L, T in kelvin and R = 0.0821 L atm mol⁻¹ K⁻¹. Always convert °C to K first (T = t + 273).
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What volume (in litres) does 1 mol of methane gas occupy at 0 °C and 2 atm? Treat it as an ideal gas and give the answer correct to 2 decimal places. Use R = 0.0821 L atm mol⁻¹ K⁻¹ and T(K) = t(°C) + 273.
Answer: 11.21 L
0.25 mol of nitrogen is sealed in a steel cylinder of volume 10 L at 0 °C. What pressure (in atm) does it exert? Treat it as an ideal gas and give the answer correct to 2 decimal places. Use R = 0.0821 L atm mol⁻¹ K⁻¹ and T(K) = t(°C) + 273.
Answer: 0.56 atm
A 5 L flask contains 2.78 g of an unknown gas at 350 K and 1 atm. Find the molar mass of the gas in g/mol, to the nearest whole number. (R = 0.0821 L atm mol⁻¹ K⁻¹)
Answer: 16