The ideal gas equation. Room temperature and pressure, RTP Limitations At RTP, 1 mol of gas molecules occupies 24.0 dm 3 Conditions are not always room.

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Presentation transcript:

The ideal gas equation

Room temperature and pressure, RTP Limitations At RTP, 1 mol of gas molecules occupies 24.0 dm 3 Conditions are not always room temperature and pressure. A gas volume depends on temperature and pressure. Ideal gas equation can calculate a gas volume, V at any temperature, T at any pressure, p

The ideal gas equation pV = nRT

Converting units for pV = nRT Before using pV = nRT, convert units to m 3, K and Pa cm 3 to m 3 × 10 −6 dm 3 to m 3 × 10 −3 °C to K+ 273 kPa to Pa × kPa = 100 × 10 3 Pa 220 cm 3 = 220 × 10 −6 cm 3 Examples 4.0 dm 3 = 4.0 × 10 −3 m 3 48 °C = = 321 K

Calculating gas volumes

Calculating a relative molecular mass

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