For the reaction shown, calculate how many moles of NH3 form when 16.72 moles of reactant completely reacts:

3 N2H4 (l)

⟶

4 NH3(g) + N2(g)

Answer : The moles of formed are, 22.3 moles.

Explanation : Given,

Moles of = 16.72 mol

The given chemical reaction is:

From the balanced chemical reaction, we conclude that:

As, 3 moles of react to give 4 moles of

So, 16.72 moles of react to give moles of

Therefore, the moles of formed are, 22.3 moles.

Answer is:  3. 5.2x10−7.
Balanced chemical reaction (dissociation): 
Ba₃(PO₄)₂(s) → 3Ba²⁺(aq) + 2PO₄³⁻(aq).
[Ba²⁺] = 0,0005 M.
Ksp(Ba₃(PO₄)₂) = 3,4·10⁻²³.
Ksp = [Ba²⁺]³ · [PO₄³⁻]².
3,4·10⁻²³ = (0,0005 M)³ · [PO₄³⁻]².
[PO₄³⁻] = √3,4·10⁻²³ ÷ 1,25·10⁻¹⁰.
[PO₄³⁻] = 5,2·10⁻⁷ M.
Ksp is the solubility product constant for a solid substance dissolving in an aqueous solution.