Question

I JUST NEED THE FINAL ANSWER PLEASE IT IS FOR MY SON

Answer 1

Concentration unit is moles/Liter.

So first we need to transform 63.0 g of phosphoric acid into moles. For this, we use the following equation:

mole = mass/molar mass

mole = 63.0/98.00

mole = 0.643 moles of H3PO4

Now, to find the concentration (molarity - M) we use the following equation:

M = moles/volume of solution

First, transform 250 mL into Liters. Just divide by 1000:

250 mL = 0.250 liters

M = 0.643/0.250

M = 2.57 mol/L

Answer: M = 2.57 mol/L