If you have 5.1g of N2 at a pressure of 100kPa and a temp of 25DegreesC, what is the volume in cm^3? Chem a level help - ideal gas equation?
回答 (1)
2016-10-16 6:19 pm
Mass, m = 5.1 g
Molar mass, M = 14.0 × 2 g/mol = 28.0 g/mol
Pressure, P = 100 kPa
Absolute temperature, T = (273 + 25) K = 298 K
Volume, V = ? dm³ (1 dm³ = 1 L)
Gas constant, R = 8.314 J / (mol K)
PV = nRT and n = m/M
Then, PV = (m/M)RT
Hence, V = mRT/(PM)
Volume, V = 5.1 × 8.314 × 298 / (100 × 28.0) dm³ = 4.5 dm³ = 4500 cm³
Molar mass, M = 14.0 × 2 g/mol = 28.0 g/mol
Pressure, P = 100 kPa
Absolute temperature, T = (273 + 25) K = 298 K
Volume, V = ? dm³ (1 dm³ = 1 L)
Gas constant, R = 8.314 J / (mol K)
PV = nRT and n = m/M
Then, PV = (m/M)RT
Hence, V = mRT/(PM)
Volume, V = 5.1 × 8.314 × 298 / (100 × 28.0) dm³ = 4.5 dm³ = 4500 cm³
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