Answer: The vapor pressure of the solution at
is 137 torr
Explanation:
As the relative lowering of vapor pressure is directly proportional to the amount of dissolved solute.
The formula for relative lowering of vapor pressure will be,
![\frac{p^o-p_s}{p^o}=i\times x_2](https://tex.z-dn.net/?f=%5Cfrac%7Bp%5Eo-p_s%7D%7Bp%5Eo%7D%3Di%5Ctimes%20x_2)
where,
= relative lowering in vapor pressure
i = Van'T Hoff factor = 1 (for non electrolytes)
= mole fraction of solute =![\frac{\text {moles of solute}}{\text {total moles}}](https://tex.z-dn.net/?f=%5Cfrac%7B%5Ctext%20%7Bmoles%20of%20solute%7D%7D%7B%5Ctext%20%7Btotal%20moles%7D%7D)
Given : 13.06 g of napthalene is present in 100 g of solution, thus (100-13.06) g = 86.94 g of hexane
moles of solute (napthalene) = ![\frac{\text{Given mass}}{\text {Molar mass}}=\frac{13.06g}{128g/mol}=0.102moles](https://tex.z-dn.net/?f=%5Cfrac%7B%5Ctext%7BGiven%20mass%7D%7D%7B%5Ctext%20%7BMolar%20mass%7D%7D%3D%5Cfrac%7B13.06g%7D%7B128g%2Fmol%7D%3D0.102moles)
moles of solvent (hexane) = ![\frac{\text{Given mass}}{\text {Molar mass}}=\frac{86.94g}{86g/mol}=1.01moles](https://tex.z-dn.net/?f=%5Cfrac%7B%5Ctext%7BGiven%20mass%7D%7D%7B%5Ctext%20%7BMolar%20mass%7D%7D%3D%5Cfrac%7B86.94g%7D%7B86g%2Fmol%7D%3D1.01moles)
Total moles = moles of solute (napthalene) + moles of solvent (hexane) = 0.102 + 1.01 = 1.112
= mole fraction of solute (napthalene) =![\frac{0.102}{1.112}=0.0917](https://tex.z-dn.net/?f=%5Cfrac%7B0.102%7D%7B1.112%7D%3D0.0917)
![\frac{151-p_s}{151}=1\times 0.0917](https://tex.z-dn.net/?f=%5Cfrac%7B151-p_s%7D%7B151%7D%3D1%5Ctimes%200.0917)
![p_s=137torr](https://tex.z-dn.net/?f=p_s%3D137torr)
Thus the vapor pressure of the solution at
is 137 torr
The answer would be 1952.5 grams of potassium sulfate solution. The way to get the answer is to use the equation, 617/x = 31.6%/1 and then cross multiply to get 31.6%x= 617grams and then 0.316x=617 grams so then x = 617/0.316= 1952.5 grams.
Answer:
the laws of the conservation of mass, the law of definite proportion, and the law of multiple proportions.
Explanation:
CH₄ + 2 O₂ → CO₂ + 2 H₂O
Explanation:
In the combustion reaction methane (CH₄) will react with oxygen (O₂) to produce carbon dioxide (CO₂) and water (H₂O).
CH₄ + O₂ → CO₂ + H₂O
To balance the chemical equation the number of atoms of each element entering the reaction have to be equal to the number of atoms of each element leaving the reaction, in order to conserve the mass.
So the balanced chemical reaction will be:
CH₄ + 2 O₂ → CO₂ + 2 H₂O
Learn more about:
balancing chemical equations
brainly.com/question/8886561
#learnwithBrainly
The statement 'what stars are made of' is an example of a question that could be answered using cosmological models.
<h3>
What are cosmological models?</h3>
Cosmological models are scientific models to understand the forces that shape the structure of the universe.
The cosmological model answers diverse types of inquiries such as ''what stars are made of' because this model describes the composition of celestial bodies (including stars) in the universe.
The cosmological model can examine different questions about the universe including its composition, structure, evolutionary trajectories, etc.
In conclusion, the statement 'what stars are made of' is an example of a question that could be answered using cosmological models.
Learn more about cosmological models here:
brainly.com/question/14507985
#SPJ1