A calibration curve requires the preparation of a set of known concentrations of CV, which are usually prepared by dieting a stock solution whose concentration is known.
A humidifier putting moisture in the air IS a physical change.
<h2>ANSWER:</h2><h2>_____________________________________</h2><h3>
Why is there no reaction between silver and copper (II) nitrate?</h3>
For the reaction to occur, it is necessary that the metal which replaces the metal from the compound LIES above that metal in the ELECTROCHEMICAL SERIES(ECS). The metal in the compound here is Copper (II) nitrate where as the metal trying to displace is silver. Silver lies below the copper in a ECS, that means Copper is more reactive than silver. The reaction is not possible because more reactive metal displaces less reactive metal from its compound, and silver is LESS reactive than copper so it cant displace the copper from copper nitrate.
<h2>_____________________________________</h2><h2>THE ELECTROCHEMICAL SERIES IS ATTACHED BELOW</h2>
The final volume of the gas is 73.359 mL
<h3 />
Given :
A sample gas has an initial volume of 72.0 mL
The work done = 141.2 J
Pressure = 783 torr
The objective is to determine the final volume of the gas.
Since, the process does 141.2 J of work on its surroundings at a constant pressure of 783 Torr. Then, the pressure is external.
Converting the external pressure to atm; we have
External Pressure P
:
= 783 torr × ![\frac{1 atm}{760 torr}](https://tex.z-dn.net/?f=%5Cfrac%7B1%20atm%7D%7B760%20torr%7D)
= 1.03 atm
The work done W = ![Pext V](https://tex.z-dn.net/?f=Pext%20V)
The change in volume ΔV= ![\frac{W}{Pext}](https://tex.z-dn.net/?f=%5Cfrac%7BW%7D%7BPext%7D)
ΔV = ![\frac{141.2 J \frac{1 L atm}{101.325 J} }{1.03 atm}](https://tex.z-dn.net/?f=%5Cfrac%7B141.2%20J%20%5Cfrac%7B1%20L%20atm%7D%7B101.325%20J%7D%20%7D%7B1.03%20atm%7D)
ΔV = ![\frac{0.0014}{1.03}](https://tex.z-dn.net/?f=%5Cfrac%7B0.0014%7D%7B1.03%7D)
ΔV = 0.001359 L
ΔV = 1.359 mL
The initial volume = 72.0 mL
The change in volume V is ΔV = V₂ - V₁
- V₂ = - ΔV - V₁
multiply both sides by (-), we have:
V₂ = ΔV + V₁
= 1.359 mL + 72.0 mL
= 73.359 mL
Therefore, the final volume of the gas is 73.359 mL .
Learn more about volume here:
brainly.com/question/27100414
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