1.25 g of HClo3 has_____________ molecules (how many) ?

Answer 1

HClO3 is how many moles. moles = g/molar mass.
Then 1 mole of HClO3 contains 6.022E23 molecules.

Answer 2

0.575 moles of Al2(SO4)3 has -------moles of Al3+ ions

Answer 3

36.46 g of HCL has ------------- molecules