Question

which has more molecules? 1 mole nacl 1 mole h₂o 1 mole al(oh)₃ there are all the same

Explanation:

Step1: Recall mole concept

One mole of any substance contains Avogadro's number ($6.022\times 10^{23}$) of entities (molecules, atoms, ions etc.).

Step2: Analyze given substances

1 mole of NaCl, 1 mole of H₂O and 1 mole of Al(OH)₃ each contain Avogadro's number of formula - units/molecules. So, the number of molecules (or formula - units in case of ionic compounds) is the same for 1 mole of each substance.

Answer:

D. There are all the same