The balanced chemical reaction will be:
2KClO3 = 2KCl + 3O2
We are given the amount of potassium chlorate being burned. This will be our starting point.
400.0 g KClO3 1 mol KClO3/ 122.55 g KClO3) (3 mol O2/2 mol KClO3) ( 32.00 g O2/1mol O2) = 156.67 g O2
Percent yield = actual yield / theoretical yield x 100
Percent yield =115.0 g / 156.67 g x 100
Percent yield = 73.40 %
Example 1:
Type of Change:
Evidence:
Answer:
Example 1. One change I observed was when cooking, I needed to boil water. The water was later evaporated due to the increase of heat from the stove below the pot. Heat traveled and transferred from the stove to the pot then the water. This change is from liquid to gas.
Example 2. I was mixing sugar into my tea, the sugar dissolved into the tea. This is an example of dissolving a solid into a liquid. The tea took the properties of the sugar and turned the drink sweet.
Extra, taking a hot shower and steam leaves the shower. This change is of evaporation.
Explanation:
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(B) 0.010 M
(C) 0.10 M
(D) 1.0 M
The molarity of the NaOCl solution is 0.10M
The correct answer to the question is Option C. 0.10 M
We'll begin by calculating the number of mole of NaOCl required to produce 0.010 mole of Cl₂.This can be obtained as follow:
NaOCl + 2HCl —> Cl₂ + NaCl + H₂O
From the balanced equation above,
1 mole of NaOCl reacted to produce 1 mole of Cl₂.
Therefore
0.010 mole of NaOCl will also react to produce 0.010 mole of Cl₂.
Mole of NaOCl = 0.01 mole
Volume = 100 mL = 100 / 1000 = 0.1 L
Molarity = mole / Volume
Molarity of NaOCl = 0.01 / 0.1
Therefore, the molarity of the NaOCl solution is 0.1 M
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Answer:
Option C 0.10 M
Explanation:
you are not providing the reaction, but luckily we have data to write the equation. We know that we are taking HCl and NaOCl to produce Cl2, the reaction is as follow:
NaOCl + 2HCl ---------> Cl₂ + NaCl + H₂O
From this reaction, we know that we have excess of acid that is added to 100 mL (0.1 L) of NaOCl, and this produces 0.010 moles of Chlorine.
All we have to do here, is apply stechiometry. We already know that the acid is in excess, so the moles produced would be the moles of the limiting reactant, in this case, the NaOCl.
According to the reaction NaOCl and Cl2 has a mole ratio of 1:1, so the moles of Cl2 would be the same moles that NaOCl lost so:
moles Cl2 = moles NaOCl = 0.010 moles
Then the concentration:
M = 0.010 / 0.1
M = 0.10 M
This is the molarity of NaOCl
Within the glass, water tries to maximize its surface area, and on top of the glass, water tries to minimize its surface area.
Water's surface tension is greater inside the glass than on top of the glass.
Adhesive forces between water and the glass get weaker with height.
Answer: The correct answer is within the glass, adhesive forces dominate, and on top of the glass, cohesive forces dominate.
Explanation:
Adhesive forces are defined as the molecular forces which are present between different substances. For Example: When water is poured into glass, the molecular forces between the walls of container and water molecules.
Cohesive forces are defined as the molecular forces which are present between same substances.
When water is put in the glass, two types of meniscus form, one is concave meniscus and another is convex meniscus.
Concave meniscus is formed due to adhesive forces and is dominating inside the glass.
Convex meniscus is formed due to cohesive forces and is dominating on the top of glass. As, on the top of glass no walls of glass are present. So, water molecules stick together to other water molecules.
Hence, the correct answer is within the glass, adhesive forces dominate, and on top of the glass, cohesive forces dominate.
Answer:
The formula for molality is m = moles of solute / kilograms of solvent. In problem solving involving molality, we sometimes need to use additional formulas to get to the final answer. One formula we need to be aware of is the formula for density, which is d = m / v, where d is density, m is mass and v is volume
Explanation:
it is a measure of the concentration of a solute in a solution in terms of amount of substance in a specified amount of mass of the solvent. This contrasts with the definition of molarity which is based on a specified volume of solution.
Answer:
C. The enthalpy of a reaction is the sum of the enthalpies of intermediate reactions.
Explanation:
The heat of any reaction ΔH∘f for a specific reaction is equal to the sum of the heats of reaction for any set of reactions which in sum are equivalent to the overall reaction.