Three solutions 39.0 ml of 0.2 m kno₃; 59.0 ml of 0.9 m ca(no₃)₂; and 63.0 ml of 0.345 m kcl were poured together to make one new solution. what is the concentration of cl⁻ after mixing? answer in units of mol/l.

[Cl⁻] = 0.135 M

Explanation:

The concentration of Cl⁻ is equal to the total moles of Cl⁻ divided by the total volume:

C = n/V

All of the moles of Cl⁻ come from dissociation of the KCl:

KCl ⇒ K⁺ + Cl⁻

We will calculate the moles of Cl⁻ based on the amount of KCl added by using the molar ratio of 1:1.

(0.345 mol/L)(63.0 mL) = (21.735 mmol KCl)(Cl⁻/KCl) = 21.735 mmol Cl⁻

Extra significant figure are kept to avoid round-off errors.

Now we can calculate the total volume, which is the sum of the volume of the three solutions added:

(39.0 mL) + (59.0 mL) + (63.0 mL) = 161.0 mL

Finally, we calculate the concentration of Cl⁻

[Cl⁻] = (21.735 mmol) / (161.0 mL) = 0.135 M

the answer to your question is c.

if you read the house of usher you should know that the house was haunted

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.