Question

If anyone could please help me with this i'd really appreciate it!

Answer 1

Answer:

0.027 moles to the nearest thousandth.

Explanation:

2H3PO4 (aq) + 3 Ba(OH)2 (aq) ----> 6H2O (l) + Ba3(PO4)2 (s)

From the equation  3 moles of Ba(OH)2 reacts with 2 moles of H3PO4.

So 1 mole of Ba(OH)2 reacts with  2/3 mole of H3PO4.

The number of moles of Ba(OH)2 in the solution is  0.214 * 0.168 = 0.039804 moles.

So the number of moles of H3PO4 is 2/3 * 0.039804

= 0.027 moles to the nearest thousandth.

Answer 2

Answer:

The answer to your question is:  0.0265 moles of H3PO4    

Explanation:

Data

[H3PO4] = ?

Volume Ba(OH)2= 0.186 l

[Ba(OH)2] = 0.214 M

Equation

                 2H3PO4 (aq) + 3 Ba(OH)2 (aq) ---> 6H2O (l) + Ba3(PO4)2 (s)

Process

Molarity = moles / volume

moles = Molarity x volume

moles of Ba(OH)2 = 0.214 x 0.186

                             = 0.0398

Rule of three

        2 moles of H3PO4 --------------------  3 moles of Ba(OH)2

        x                              --------------------   0.0398 moles of Ba(OH)2

                  x = (0.0398 x 2) / 3

                 x =  0.0265 moles of H3PO4