GCSE Chemistry (AQA)

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Advanced Gas Volume Calculations

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Quantitative chemistry Use of amount of substance in relation to volumes of gases

Advanced Gas Volume Calculations

7:06 Amount of Substance and Gas Volume
Spec 4.3.5
Previous Gas Volume Calculations Next The Reactivity Series
  • Calculations involving gases can include substances not in a gaseous state.
  • At the same temperature and pressure, gas volumes follow the same ratio as their moles.
  • Example reaction: HCL + NaHCO3 ��� NaCl + H2O + CO2.
  • To determine the volume of CO2 produced from 105.00 grams of NaHCO3:
  • Calculate moles using the equation: N = M / MR (moles = mass / molar mass).
  • Relative formula mass of NaHCO3 is 84, resulting in 1.25 moles used.
  • Mole ratio shows 1:1 ratio between NaHCO3 and CO2.
  • Volume of CO2 is calculated using: Volume = moles x 24 (at room temperature and pressure).
  • 1.25 moles of CO2 results in 30 liters cubed.
  • Example problem: Calculate mass of NaHCO3 to produce 100 cm�� of CO2.
  • Convert volume from cm�� to liters cubed (100 cm�� = 0.1 liters cubed).
  • Calculate moles of CO2 using: moles = volume / 24.
  • 0.1 liters cubed results in 0.0042 moles of CO2.
  • Mole ratio is 1:1, so 0.0042 moles of NaHCO3 are needed.
  • Calculate mass using: mass = moles x relative formula mass.
  • Relative formula mass of NaHCO3 is 84, resulting in 0.35 grams needed.

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