Gases at RTP & Ideal Gas Equation

18 Question-and-Answer flashcards covering RTP volumes, unit conversions, the ideal gas equation, and worked numerical examples.

What volume is occupied by 1 mol of any ideal gas at RTP?

24.0 dm³ (24 000 cm³)

What temperature and pressure define RTP?

20 °C (293 K) and 101 kPa

Give the formula to find moles of a gas from its volume in dm³ at RTP.

Moles = Volume (dm³) ÷ 24.0

Give the formula to find moles of a gas from its volume in cm³ at RTP.

Moles = Volume (cm³) ÷ 24 000

Give the formula to calculate the volume (dm³) of a gas at RTP from its moles.

Volume = Moles × 24.0

State the conversion factor between cm³ and dm³.

1000 cm³ = 1 dm³

How do you convert degrees Celsius to Kelvin?

Add 273 to the temperature in °C

Write the ideal gas equation.

pV = nRT

In pV = nRT, what does p represent and in what units?

Pressure in Pascals (Pa)

In pV = nRT, what does V represent and in what units?

Volume in cubic metres (m³)

What is the numerical value (with units) of the gas constant R?

8.31 J mol⁻¹ K⁻¹

In pV = nRT, in what units must temperature T be expressed?

Kelvin (K)

List the required SI units when applying the ideal gas equation.

p: Pa, V: m³, T: K, n: mol, R: 8.31 J mol⁻¹ K⁻¹

How do you convert kPa to Pa?

Multiply by 1000 (1 kPa = 1000 Pa)

How do you convert dm³ to m³?

Divide by 1000 (1 dm³ = 0.001 m³)

Calculate the number of moles in 2.40 dm³ of gas at RTP.

0.10 mol (2.40 ÷ 24.0)

What volume does 0.75 mol of gas occupy at RTP?

18.0 dm³ (0.75 × 24.0)

How many moles are present in 0.015 m³ of gas at 101 000 Pa and 298 K?

≈ 0.61 mol using n = (p × V) ÷ (R × T)