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If 0.020 mol of LiOH are dissolved to make 4.5L of solution, what is the molarity?
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0.0044 M or mol/L

Explanation:

We have to know that molarity is moles of a certain thing/litres of solution.

So the info we are given is we have 0.020 mol of LiOH and the litres of solution is 4.5L, hence we just plug it into the

Molarity forumla= moles of a certain thing/litres of solution.

Molarity (M)= 0.020/4.5 = 0.0044 M or mol/L

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.