Worked examples: SACE Stage 2 Chemistry Data Sheet

Selected worked examples

1. Periodic table · amount from mass

   Formula or reference: n = m/M. Use the atomic masses to calculate M.

   Units and conditions: Use grams for m when M is in g/mol.

   Worked example: Using Mg = 24.31, a 4.862 g sample of pure magnesium contains 0.2000 mol.

2. Electrochemistry · standard reduction potential

   Formula or reference: Subtract the anode’s tabulated reduction potential from the cathode’s.

   Units and conditions: Both values are expressed in volts for standard conditions.

   Worked example: If the cathode entry is +0.34 V and the anode entry is −0.76 V, the cell potential is +1.10 V.