Find the wrong figure in each sum

Exercise and reference answers

Questions

1. Statement parts

   1. Moles
   2. of
   3. H2O
   4. in
   5. 36
   6. g
   7. =
   8. 2.5

   Correction

   36 g / 18 = 2 moles, not 2.5.

   Incorrect part

   2.5

2. Statement parts

   1. Molecules
   2. in
   3. 0.25
   4. mole
   5. =
   6. 1.5
   7. *
   8. 10^23

   Correction

   0.25 * 6.022e23 = 1.5055e23. Use 1.51 * 10^23 to be precise.

   Incorrect part

   1.5

Instructions

Each line works through a mole calculation. Tap the piece of it that is wrong.