reaction rates using moles

• What is the rate of reaction a measure of?


  A changing property per unit time
• In what units is the rate of reaction frequently expressed?


  g/s or cm³/s
• Why is it often more useful to express the rate of reaction in terms of moles?


  Because it provides a clearer understanding of the reaction's progress
• What is the unit for rate of reaction when expressed in moles?


  mol/s
• What is necessary before measuring moles directly?


  It is necessary to calculate the rate using the rate formula triangle
• What is the process to convert mass per unit time to moles per unit time?


  • Use the formula: mass per unit time ÷ molar mass of the substance = moles per unit time
• How do you convert time from minutes to seconds?


  Multiply the time in minutes by 60
• How do you calculate moles from mass loss?


  Use the formula: Moles = mass / Mr
• What is the molar mass of carbon dioxide (CO₂) used in the example?


  44.0 g/mol
• How do you calculate the rate of reaction in mol/s?

  Rate of reaction = moles / time in seconds
• What is the rate of reaction for the marble chips example?


  1. 1 x 10^-4 mol/s
• How do you convert volume of gas to moles?


  Use the formula: Moles = volume (cm³) / molar gas volume (24,000 cm³/mol)
• What is the molar gas volume used in the example?


  24,000 cm³/mol
• What is the rate of reaction for the magnesium ribbon example?


  1. 7 x 10^-6 mol/s