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
My name is Ann [436]
3 years ago
8

Determine the vapor pressure of a solution at 25°C that contains 76.6 g of glucose (C6H12O6) in 250.0 mL of water. The vapor pr

essure of pure water at 25°C is 23.8 torr.70.8 torr7.29 torr72.9 torr22.9 torr23.1 torr
Chemistry
1 answer:
Orlov [11]3 years ago
3 0

Answer:

The vapor pressure of solution is 23.1 Torr

Explanation:

Colligative property of vapour pressure.

ΔP = P° . Xm

ΔP = Pressure of vapour from pure solvent - Pressure of vapour from solution

ΔP = P° - Ps

Xm = mole fraction of solute

Molar weight of glucose: 180 g/m

Moles of glucose = mass / molar weight → 76.6 g / 180 g/m = 0.425moles

If water volume is 250 mL, this volume is occupied by 250 g of solvent.

Density of water : 1g/mL

Molar weight of water: 18 g/m

250 g / 18g/m = 13.89 moles of solvent

Total moles = moles of solute + moles of solvent

0.425 + 13.89 = 14.315 moles

Mole fraction of solute = 0.425 / 14.315 = 0.029

23.8 Torr - Ps = 23.88 Torr . 0.029

Ps = 23.88 Torr . 0.029 - 23.8 Torr ⇒ 23.1 Torr

You might be interested in
How much °f of 35°C ? <br>help me please<br>​
MakcuM [25]

Answer: 95 degrees fahrenheit hope this helps :]

Explanation:

6 0
3 years ago
What is the percent yield if 3.47 g of copper is produced when 1.87 g of aluminium is reacted with excess of copper (II) sulfato
Serhud [2]

Answer:

copper is limiting

Explanation:

5 0
1 year ago
Which reactant will be in excess, and how many moles of it will be left over?
timofeeve [1]

Answer:

Oxygen with 0.36 moles left over

Explanation:

5 0
3 years ago
Read 2 more answers
If 12.5 grams of strontium hydroxide is reacted with 150 mL of 3.5 M carbonic acid, identify the limiting reactant.
kiruha [24]

Answer:

Sr(OH)₂ will be the limiting reagent.

Explanation:

First of all, you should know the following balanced chemical equation:

2 H₂CO₃ + 2 Sr(OH)₂ → 4 H₂O + Sr₂(CO₃)₂

The balanced equation is based on the Law of Conservation of Mass, which says that matter cannot be created or destroyed. Therefore, the number of each type of atom on each side of a chemical equation must be the same.      

The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.

To determine the limiting reagent, it is possible to use the reaction stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction). By stoichiometry the following amounts in moles react:

  • strontium hydroxide: 2 moles
  • carbonic acid: 2 moles

Now, you know the following masses of the elements:

  • Sr: 87.62 g/mole
  • O: 16 g/mole
  • H: 1 g/mole

So the molar mass of strontium hydroxide is:

Sr(OH)₂= 87.62 g/mole + 2*(16 g/mole + 1 g/mole)= 121.62 g/mole

You apply the following rule of three, if 121.62 grams of hydroxide are present in 1 mole, 12.5 grams in how many moles are they?

moles of strontium hydroxide=\frac{12.5 grams*1 mole}{121.62 grams}

moles of hydroxide= 0.103 moles

On the other hand, you have 150 ml of 3.5 M carbonic acid. Since molarity is the concentration of a solution expressed in the number of moles dissolved per liter of solution, you can apply the following rule of three: if in 1 L there are 3.5 moles of carbonic acid, in 0.150 L (being 1 L = 1000 mL, 0.150 L = 150 mL) how many moles of acid are there?

molesofcarbonicacid=\frac{0.150 L*3.5 moles}{1 L}

moles of carbonic acid= 0.525 moles

Finally, to calculate the limiting reagent, you can use a simple rule of three as follows: if by stoichiometry 2 mole of strontium hydroxide reacts with , how much moles of carbonic acid will be needed if 0.103 moles of strontium hydroxide react?

molesofcarbonicacid=\frac{0.103 moles of strontium hydroxide*2 moles of carbonic acid}{2 moles of strontium hydroxide}

moles of carbonic acid= 0.103 moles

But 0.525 moles are available. Since more moles are available than you need to react with 0.103 moles of strontium hydroxide, <u><em>Sr(OH)₂ will be the limiting reagent.</em></u>

7 0
3 years ago
WORTH 20 POINTS Confirmation bias is where a scientist may change the data to support a certain bias.
Orlov [11]

Answer:

True

Explanation:

Confirmation Bias is the tendency to look for information that supports, rather than rejects, one’s preconceptions, typically by interpreting evidence to confirm existing beliefs while rejecting or ignoring any conflicting data

8 0
2 years ago
Other questions:
  • Is frying an egg a physical or chemical change
    6·1 answer
  • What is the SI unit of time?<br> A. second<br> B. minute<br> C. hourD.<br> day
    7·2 answers
  • A nanometer (nm) is 1/billion of a meter (1×10^-9 m). Write this number:
    9·1 answer
  • Which statement describes the valence electrons in metallic bonds? a)They are shared equally between two atoms. b)They are share
    7·2 answers
  • How many individual orbitals does carbon use for all of its electrons? Remember, there are two electrons in each filled orbital
    11·1 answer
  • Consider the reaction: I2(g)+Cl2(g)⇌2ICl(g) Kp= 81.9 at 25 ∘C. Calculate ΔGrxn for the reaction at 25 ∘C under each condition: -
    11·2 answers
  • If an unknown sample contains 39.04% sulfuric acid by mass, then a 0.9368 g of that sample would require _____ mL of 0.2389 M Na
    14·1 answer
  • What is the chemical name for OBr2?
    10·1 answer
  • Explain three reasons why potassium is larger than sodium.
    15·1 answer
  • Which of the following describes how further studies supported the work done by Ernest Rutherford?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!