C=90% H=10% molecular formula ???

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

16. in a reaction that has reached equilibrium, a. the forward and reverse reactions are occurring at the same rate. b. the reactants and products are in equal concentrations. c. the forward reaction has gone further than the reverse reaction. d. there are equal numbers of atoms on both sides of the equation. e. a, b, and d are correct.

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?