The formula for the ionic compound formed between calcium ions and chloride ions is CaCl2. What does this formula tell you about
the compound?
Each molecule of CaCl2 has one calcium ion and two
chloride ions.
Each calcium ion in the compound has exactly two chloride
ions bonded to it.
Calcium and chloride ions exist in a 1:2 ratio in a crystal of
CaCl2.
All of these are true.

n+h→nh3

we must remember that nitrogen and hydrogen are both diatomic molecules in their standard gas form. this adjusts the equation to

n2+h2→nh3

now we need to adjust coefficients in order to balance the atoms on each side of the equation. currently we have 2 atoms of nitrogen and 2 atoms of hydrogen on the reactant side and 1 atom of nitrogen and 3 atoms of hydrogen on the product side.

we can balance the hydrogens by placing a coefficient of 2 in front of ammonia and a coefficient of 3 in front of the hydrogen.

n2+3h2→2nh3

this gives us 6 hydrogen on each side and coincidentally the nitrogens now equal 2 on each side.

can you list the answers so i can answer

bcde is the incorrect answer it is a