Three Chemistry questions..

1. Which of the following is an atomic element?

a) hydrogen

b) bromine

c) oxygern

d) lithium

e) fluorine

2. 6.00 moles of sodium perchlorate contains the same number of atoms as

a) 6.00 moles of potassium permanganate.

b) 6.00 moles of sodium hydroxide.

c) 6.00 moles of sodium phosphate.

d) 6.00 moles of barium sulfide.

e) 6.00 moles of lithium nitrite.

3. Write a structural formula for water. (This question is attached as an image.. )

Draw the molecule on the canvas by choosing buttons from the Tools (for bonds), Atoms, and Advanced Template toolbars. The single bond is active by default.