chemistry molarity

Question

If A solution of phosphoric acid has a molarity of 0.307, how many moles are present in 553.7 mL of the solution?

Answer 1

Molarity means moles of solute per liter of solution, so 0.307 M phosphoric acid = 0.307 mol H₃PO₄/L

Since we have only 553.7 ml which is = 0.5537 L, we can find the number of moles we have...

0.307 moles / L x 0.5537 L = 0.1699 moles H₃PO₄ = 0.170 moles (3 sig. figs.)