Question

If the gram-formula mass of substance X is 180 g/mol, determine the molarity of the solution at Point E

Answer 1

Answer;

= 5 M or 5 moles/liter

Explanation;

At point E, 90 g of substances X are dissolved in 100 g of the solvent.

100g of the solvent is equal to 100 ml

Molarity is the number of moles of a substance in one liter of a solvent.

90 g of X are in 100 ml

But; the RFM of X = 180 g/l

Therefore; the moles of X in 90 g = 90/180

                                                        = 0.5 moles

Therefore;

0.5 moles of X are contained in 100 ml of the solvent;

Thus, molarity = 0.5 × 1000/100

                       = 5 M or 5 moles/liter