Answer:
0.13M and 0.16m.
Explanation:
Molarity is defined as the moles of solute present in 1L of solution.
Molality is the moles of solute per kg of solvent.
To solve this problem we need to convert the mass of sucrose to moles using its molar mass and finding the volume in L of the solution and the mass in kg of solvent:
<em>Moles sucrose: </em>
Molar mass:
12C = 12*12.01g/mol = 144.12g/mol
22H = 22*1.005g/mol = 22.11g/mol
11O = 11*16g/mol = 176g/mol
Molar mass of sucrose is 144.12g/mol + 22.11g/mol + 176g/mol = 342.23g/mol
Moles are:
19.0g * (1mol / 342.23g/mol) = 0.0555 moles of sucrose
<em>Liters solution:</em>
425mL * (1L / 1000mL) = 0.425L
<em>kg solvent:</em>
425mL * (0.82g/mol) = 348.5g * (1kg / 1000g) = 0.3485kg
<em>Molarity:</em>
0.0555 moles / 0.425L
<h3>0.13M</h3><h3 />
<em>Molality:</em>
0.0555 moles / 0.3485kg
<h3>0.16m</h3>
Entropy change is the randomness of the thermodynamic system. The change in the entropy when the water is condensed is 1573 J/K.
<h3>What is the entropy change?</h3>
An entropy change is a product of mass and the ratio of the enthalpy of vaporization to the temperature.
Given,
Enthalpy of vapourization = 2257 J/gK
The temperature in kelvin = 373 k
The change in entropy is calculated as:
![\begin{aligned} \rm \Delta S &= \rm m (\dfrac{\Delta H_{vap}}{T})\\\\&= 260 (\dfrac{2257}{373})\\\\&= 1573.24\;\rm J/K\end{aligned}](https://tex.z-dn.net/?f=%5Cbegin%7Baligned%7D%20%5Crm%20%5CDelta%20S%20%26%3D%20%5Crm%20m%20%28%5Cdfrac%7B%5CDelta%20H_%7Bvap%7D%7D%7BT%7D%29%5C%5C%5C%5C%26%3D%20260%20%28%5Cdfrac%7B2257%7D%7B373%7D%29%5C%5C%5C%5C%26%3D%201573.24%5C%3B%5Crm%20J%2FK%5Cend%7Baligned%7D)
Therefore, the change in entropy is 1574 J/K.
Learn more about entropy here:
brainly.com/question/14798359
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Answer:
state symbol meaning
[s] solid
liquid
gas
aq] aqueous dissolved in water
Explanation:
often chemical equations are written showing the state that each substance is in. the [s] sign means that the compound is a sold. the l sign means the substance is a liquid. the aq sign stands for aqueous in water and means the compound is dissolved in water
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