Question

Calculate the mole fraction of HCL in a solution of hydrochloric acid in water containing 36% HCl by weight

Answer 1

Answer:

the answer is 40 persent

Answer 2

0.216

HCl is 36% by weight.

That is 36g of HCl in 100ml of water.

So the mass of HCl=36g

Mass of water=100-36

                      = 64ml

The Molar mass of HCl   = 36.45

The Molar mass of water= 18.01

Therefore, the number of moles of HCl= $\frac{mass of HCl}{molar mass of HCl}$

                                                                = $\frac{36}{36.45}$

                                                                = 0.98moles

Number of moles of water= $\frac{mass of water}{molar mass of water}$

                                           = $\frac{64}{18.01}$

                                           = 3.55 moles

Thus, the mole fraction of HCl= $\frac{number of moles of HCl}{total number of moles of HCl and water}$

                                                 = $\frac{0.98}{0.98+3.55}$

                                                 = $\frac{0.98}{4.53}$

                                                 = 0.216

The mole fraction of HCl is 0.216.