The answer is:
The third option, 79.8%
<h2>Why?</h2>To calculate the percent yield we need to divide the actual yield by the theoretical yield, and then, multiply it by 100 in order to find the percent.
So, we from the statement we know the following information:
Let's use the following formula and substitute the given information:
Hence, we have that the correct option is the third option, the percent yield is 79.8%.
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Answer:
70g of HCl
Check the attachment below. Locate 25C and then follow the line where it meets the curve.
The answer is 4.9 moles of salt will be needed to add to 1 kg of water to change the boiling point by 5 °C.
<h3>What is Boiling Point Elevation ?</h3>Boiling point elevation is the phenomenon that occurs when the boiling point of a liquid (a solvent) is increased when another compound is added, such that the solution has a higher boiling point than the pure solvent.
Boiling point elevation occurs whenever a non-volatile solute is added to a pure solvent.
ΔT = i * Kb * m
where m, Kb and i are the molality of solution, ebullioscopic constant and Van't Hoff factor respectively
The data given in the question is ΔT = 5 °C
mass of solvent = 1 kg
Kb = 0.51 °C/(mol/kg)
Van't Hoff Factor for NaCl is 2
Substituting the values in the above equation
moles of salt = 4.9
Therefore 4.9 moles of salt will be needed to add to 1 kg of water to change the boiling point by 5 °C.
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Answer:
22.44°C will be the final temperature of the water.
Explanation:
Heat lost by tin will be equal to heat gained by the water
Mass of tin =
Specific heat capacity of tin =
Initial temperature of the tin =
Final temperature = =T
Mass of water=
Specific heat capacity of water=
Initial temperature of the water =
Final temperature of water = =T
On substituting all values:
we get, T = 22.44°C
22.44°C will be the final temperature of the water.