What characters do all minerals share

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

Abeaker with 2.00×102 ml of an acetic acid buffer with a ph of 5.000 is sitting on a benchtop. the total molarity of acid and conjugate base in this buffer is 0.100 m. a student adds 4.70 ml of a 0.360 m hcl solution to the beaker. how much will the ph change? the pka of acetic acid is 4.740.

Answer explain why it is not possible to deduce a complete order of reactivity.