One mole of water weighs 18 grams. H₂O is composed of 2H= 2 and 1 0=16 adding gives you 18. number of moles= mass/ Relative Molecular Mass
Therefore, mass= Relative Molecular Mass×number of moles
= 18×5 moles
= 90 grams
Answer:
10.35
Explanation:
multiply moles by molar mass from periodic table
The correct answer is b, 18 protons
Ionic crystals are hard because of tight packing lattices, say, the positive and negative ions are strongly attached among themselves.