The answer is A. Gas particles!
Explanation:
Since, NaCl exists as
and
in solution. Therefore, Van't Hoff factor (i) will be equal to 2.
Now, we assume that there are "n" moles of NaCl in the given solution. And, we assume that there is 1 kg of solvent (water).
So, ![\frac{\Delta P}{P} = i \times \frac{\text{no. of moles of NaCl}}{\text{Mass of water in kg}}](https://tex.z-dn.net/?f=%5Cfrac%7B%5CDelta%20P%7D%7BP%7D%20%3D%20i%20%5Ctimes%20%5Cfrac%7B%5Ctext%7Bno.%20of%20moles%20of%20NaCl%7D%7D%7B%5Ctext%7BMass%20of%20water%20in%20kg%7D%7D)
![\frac{23.8 torr - 17.5 torr}{23.8 torr} = 2 \times \frac{n}{1}](https://tex.z-dn.net/?f=%5Cfrac%7B23.8%20torr%20-%2017.5%20torr%7D%7B23.8%20torr%7D%20%3D%202%20%5Ctimes%20%5Cfrac%7Bn%7D%7B1%7D)
0.264 = ![2 \times \frac{n}{1}](https://tex.z-dn.net/?f=2%20%5Ctimes%20%5Cfrac%7Bn%7D%7B1%7D)
n = 0.132
Also, moles of water will be calculated as follows.
Moles of water =
= 55.56 mol
Hence, mole fraction of NaCl is calculated as follows.
Mole fraction = ![\frac{0.132}{55.56 + 0.132}](https://tex.z-dn.net/?f=%5Cfrac%7B0.132%7D%7B55.56%20%2B%200.132%7D)
= ![2.37 \times 10^{-3}](https://tex.z-dn.net/?f=2.37%20%5Ctimes%2010%5E%7B-3%7D)
Hence, mole fraction of NaCl will be
.
At
, the vapor pressure will be calculated as follows.
71.9 - p = 18.98
p = 52.92 torr
Therefore, vapor pressure of the given solution is 52.92 torr.
Answer: Ionic bonds form only between metals and nonmetals. That's because metals “want” to give up electrons, and nonmetals “want” to gain electrons. It takes energy to remove valence electrons from an atom and form a positive ion. Energy is released when an atom gains valence electrons and forms a negative ion
Answer: 1.788 volts.
Explanation:
To solve this problem we can combine battery cells to create higher voltages. Building more lemon batteries and connecting them with a metal wire from "+" to "-" adds the voltage from each cell. The two lemon batteries above, combine to produce a voltage of 1.788 volts.