1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
sladkih [1.3K]
3 years ago
14

Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: CaO (s) H 2O (l) Ca(OH) 2 (s) In a parti

cular experiment, a 2.00-g sample of CaO is reacted with excess water and 2.14 g of Ca(OH) 2 is recovered. What is the percent yield in this experiment
Chemistry
1 answer:
Nimfa-mama [501]3 years ago
8 0
Find the moles of CaO

divide mass (2.0g) by the RFM which is 56 (Ca is 40 add that to O which is 16 making 56) this gives 0.0356 moles.

Find the theoretical mass by multiplying the moles of CaO (which is 0.0356 as there are no balancing number making the ratio 1:1) by the RFM of Ca(OH)2 which is 74 (40+16+16+1+1)

74 (Ca(OH)2 RFM) x 0.0357 (CaO moles) = 2.6g which is the theoretical mass of Ca(OH)2

Find percentage yield by dividing the actual mass of Ca(OH)2 by the theoretical and then x100 this Should give you 82.3%
You might be interested in
When doing a recrystallization what observations would prompt
Volgvan
<h2>Observation of purified crystals.</h2>

Explanation:

  • Recrystallization is the process in which a compound is dissolved in a hot solvent and then allowed to cool which forms the crystals.
  • It is a technique used for purification of solids.
  • Recrystallization mainly depends on the solubility of the solvent that means the solid should be soluble in the solvent when it is hot and should be insoluble in the same solvent when it is cool.
  • The observations while doing recrystallization is to observe the purified crystals obtained and to filter it out.

5 0
3 years ago
Which statement is incorrect?
Katena32 [7]

Answer:

e. When the indicator changes color and remains, 2 more drops of the solution in the buret should be added.

Explanation:

<em>Which statement is incorrect? </em>

<em>Select one: </em>

<em> a. The volume of solution in the buret should be recorded when the endpoint is reached. </em> CORRECT. At the endpoint, the titrant is expected to have completely reacted with the titrand.

<em>b. It is good practice to place the flask over a white background to better observe the color change of the solution.</em>  CORRECT. Using a white background makes it easier to detect the changes in the color of the indicator.

<em>c. The endpoint is when the indicator changes color.</em> CORRECT. This is the function of an indicator.

<em>d. Phenolphthalein will go from a colorless solution to a pink solution for the addition of NaOH to an acid solution.</em>  CORRECT. Phenolphthalein is colorless when pH < 8.3 and it is pink when pH > 10.0.

<em>e. When the indicator changes color and remains, 2 more drops of the solution in the buret should be added.</em> INCORRECT. When the endpoint is reached, no more titrant should be added.

4 0
3 years ago
What volume of 12 M HCl solution is needed to make 2.5 L of 1.0 M HCI?
Jlenok [28]

Answer:

0.21 L of 12 M HCL

Explanation:

CV=CV

(12)(x)=(1.0)(2.5)

x=0.21

8 0
3 years ago
Which atoms combine together during fusion reaction on the sun?
shusha [124]

Answer:

Hydrogen

Explanation:

5 0
3 years ago
Read 2 more answers
Which of the following is not one of the three categories of mechanical<br>waves?​
solong [7]

Answer:

d. Radio wave

Explanation:

There are three types of mechanical waves, transverse waves, longitudinal waves, and surface waves

8 0
3 years ago
Other questions:
  • The proportion of dissolved substances in seawater is usually expressed in
    13·1 answer
  • a container with a volume of 3.46 liters contains a gas at a pressure of 1.30 atm and temperature of 274.27 kelvins how many mol
    15·1 answer
  • Can someone help me with the question in the image. if it is correct i will mark as brainliest
    11·1 answer
  • Nonrenewable energy resources include what types of energy ?
    7·2 answers
  • Enzymes catalyze reaction by stabilizing the _________. If the enzyme binds to the substrate too well, the activation energy for
    13·2 answers
  • Aluminum has a density of 2.70 g/cm^3. How Many moles of aluminum are in a 13.2 cm^3 block of the metal substance? Fill in the t
    6·1 answer
  • What shapes do s, p, d represent?
    12·1 answer
  • What happens when two forces act in the same direction?
    15·1 answer
  • Whitney is making sweet tea. She adds 15 grams of
    12·1 answer
  • Match each definition to the appropriate term.
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!