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
weeeeeb [17]
3 years ago
5

How many grams of KOH are required to prepare 500. mL of 0.450 KOH solution?

Chemistry
1 answer:
Digiron [165]3 years ago
5 0

Answer:

KOH  molar mass = 39 + 16 + 1 = 56g

To make 1 L of 1M soln needs 56g KOH

To make 500mL 1M needs 56/2 = 28g

To make 500mL 0.2M needs 28 x 0.2gn:

You might be interested in
What is always conserved in a chemical reaction?
Vaselesa [24]
The answer is b. Mass of the atoms

This is because of the law of conservation of mass. This means the mass in a system (in this case the reaction) can't change, so the quantity can't be added or removed
3 0
3 years ago
Which book has kinetic energy
bekas [8.4K]
Where is the picture
3 0
3 years ago
A propane stove burned 470 grams propane and produced 625 grams of water (this is the actual yield) C3H8 +5O2=3CO2+4H20. What wa
Liula [17]

Answer:

81.3%

Explanation:

Step 1:

The balanced equation for the reaction:

This is shown below:

C3H8 + 5O2 —> 3CO2 + 4H2O

Step 2:

Data obtained from the question. This includes:

Mass of propane (C3H8) = 470 g

Actual yield of water (H2O) = 625 g

Percentage yield of water (H2O) =?

Step 3:

Determination of the mass of propane (C3H8) burned and the mass of water (H2O) produce from the balanced equation. This is illustrated below:

C3H8 + 5O2 —> 3CO2 + 4H2O

Molar Mass of C3H8 = (3x12) + (8x1) = 36 + 8 = 44g/mol

Molar Mass of H2O = (2x1) + 16 = 2 + 16 = 18g/mol

Mass of H2O from the balanced equation = 4 x 18 = 72g

From the balanced equation above,

44g of C3H8 was burned and 72g of H2O was produced.

Step 4:

Determination of the theoretical yield of H2O. This is illustrated below:

From the balanced equation above,

44g of C3H8 produced 72g of H2O.

Therefore, 470g of C3H8 will produce = (470x72)/44 = 769.09g of H2O.

Therefore, the theoretical yield of H2O is 769.09g

Step 5:

Determination of the percentage yield of water (H2O). This is illustrated below:

Actual yield of water (H2O) = 625g

theoretical yield of H2O = 769.09g

Percentage yield of water (H2O) =?

Percentage yield = Actual yield/Theoretical yield x100

Percentage yield = 625/769.09 x100

Percentage yield = 81.3%

Therefore, the percentage yield of water (H2O) is 81.3%

4 0
3 years ago
What is a centrifuge used for?
tatiyna
<span>It is used for the separation of fluids, gas or liquid, based on density.

Hope this helps!</span>
5 0
3 years ago
Read 2 more answers
Identify and describe the different forms of precipitation shown in the images.
zloy xaker [14]

Answer:

Sleet and hail, sleet are tiny drops of water that freeze when it rains. Hail forms when a thunderstorm lifts a water droplet above the freezing level.

Explanation:

8 0
2 years ago
Other questions:
  • Which statements describe a good hypothesis? Check all that apply.
    15·2 answers
  • What is the molarity of a solution that is made by adding 57.3 g of MgO to 500.0 mL of solutions
    12·1 answer
  • 5. The element copper has naturally occurring isotopes with mass numbers of 63
    10·1 answer
  • Planetesimal definition
    9·2 answers
  • 3. The density of acetic anhydride is 1.08 g/mL. How many moles of acetic anhydride are used in this experiment
    5·1 answer
  • What is 0.0000000000000167 in scientific notation?
    12·1 answer
  • Which best represents the reaction of calcium and zinc carbonate (znco3) to form calcium carbonate (caco3) and zinc?
    5·2 answers
  • Which of the following options best explains how less chlorophyll would affect the process of photosynthesis in plants?
    11·1 answer
  • A hydrate of zinc nitrate has the formula Zn(NO3)2 . xH2O. If the mass of 1 mol of anhydrous zinc nitrate is 63.67% of the mass
    8·1 answer
  • How many atoms are present in 2.1 moles of Fe
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!