- #1
recon
- 401
- 1
Question:
Which of the following aqueous solutions contain(s) the same number of particles of solute as are contained in 250 mL of 2.0 mol/L KBr
(i) 1.0 L of 1.0 mol/L ethanol, [tex]C_2H_5OH[/tex]
(ii) 250 mL of 3.0 mol/L calcium chloride, [tex]CaCl_2[/tex]
(iii) 500 mL of 1.0 mol/L hydrochloric acid, [tex]HCl[/tex]
(iv) 500 mL of 1.0 mol/L sodium carbonate, [tex]Na_2CO_3[/tex]
The way I see it, there are 0.25 x 2 = 0.5 moles of KBr
and 0.5 x 1 = 0.5 moles of [tex]HCl[/tex] and [tex]Na_2CO_3[/tex] in (iii) and (iv). Since they all have the same number of moles, they should have the same number of atoms? Is that what they mean by "same number of particles of solute"?
But according to the answer guide, it says that the answers are (i) and (iii).
Which of the following aqueous solutions contain(s) the same number of particles of solute as are contained in 250 mL of 2.0 mol/L KBr
(i) 1.0 L of 1.0 mol/L ethanol, [tex]C_2H_5OH[/tex]
(ii) 250 mL of 3.0 mol/L calcium chloride, [tex]CaCl_2[/tex]
(iii) 500 mL of 1.0 mol/L hydrochloric acid, [tex]HCl[/tex]
(iv) 500 mL of 1.0 mol/L sodium carbonate, [tex]Na_2CO_3[/tex]
The way I see it, there are 0.25 x 2 = 0.5 moles of KBr
and 0.5 x 1 = 0.5 moles of [tex]HCl[/tex] and [tex]Na_2CO_3[/tex] in (iii) and (iv). Since they all have the same number of moles, they should have the same number of atoms? Is that what they mean by "same number of particles of solute"?
But according to the answer guide, it says that the answers are (i) and (iii).