Amount Of Substance

• What is relative atomic mass?

  average mass of one atom of a substance/ 1/12th of the mass of one carbon-12 atom
• what is the relative isotopic mass?

  $\frac{\sum_{ }^{ }\left(isotope\ abundance\ \times\ isotope\ mass\ number\ \right)}{100}$
• What is the molecular formula?

  The number and type of each atom in a molecule
• What is the empirical formula?

  The simplest whole number ratio of the elements present in a molecule
• What is the charge of a carbonate ion?

  2-
• What is the charge of a sulfate ion?

  2-
• What is the charge of a nitrate ion?

  -1
• What is the charge of an ammonium ion?

  +1
• what is the charge of a phosphate ion?

  3-
• What is the charge of a sulphur trioxide ion?

  3-
• how do you derive molecular formula from empirical and mr?

  $\frac{relative\ molecular\ mass}{relative\ mass\ of\ the\ empirical\ formula}$
• How to calculate moles of a substance

  $\frac{mass}{Mr}$
• What are moles?

  Units of measurement for the amount of a substance.
• What is Avogadros constant?

  6.022 x 10^23 (number of particles in one mole of a substance)
• How to calculate moles from conc?

  mol = conc * vol
• How to calculate the % uncertainty?

  Percentage uncertainty = (uncertainty / measured value) * 100
• What is a limiting reagent?

  The reactant that is completely consumed in a chemical reaction and limits the amount of product that can be formed.
• How to calculate moles of gases?

  moles= $\frac{volume}{24}$
• What is the ideal gas equation?

  The ideal gas equation is PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is temperature.
• What is the unit for pressure?

  Pascal
• What is the unit for temperature?

  Kelvin
• What is the unit for volume?

  m^3