Which statement is true?

What is the maximum amount of al2(so4)3 which could be formed from 15.84 g of al and 12.89 g of cuso4?

If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

As you watch a surfer ride a wave towards the shoreline, what is the shoreline? a) displacement reference b) reference point c) coordinate plane d) cartesian boundary