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
polet [3.4K]
3 years ago
14

A peak elutes from an HPLC column 17.7 cm in length in 11.1 min. What would be the width at half‑height of the peak (in seconds)

if the plate height were 8.68 μm?
Chemistry
1 answer:
saul85 [17]3 years ago
7 0

Answer:

10.98 s

Explanation:

To solve this problem we first use the formula:

  • H = L/N

Where:

  • H = Plate height (8.68 μm, or 8.68x10⁻⁶m)
  • L = Column length (17.7 cm, or 0.177 m)
  • N = Number of theoretical plates (unknown)

And solve for N:

  • N = 0.177 m / 8.68x10⁻⁶m
  • N = 20392 plates

Then we use the formula:

  • N = 5.54*(\frac{t_r}{W_{0.5}})^2

Where:

  • N is the number of theoretical plates previously calculated.
  • tr is the retention time (11.1 min, or 666s)
  • W₀.₅ Is the width at half-height (unknown)

And solve for W₀.₅:

  • W₀.₅ = 10.98 s
You might be interested in
How many grams of the excess reactant are left over according to the reaction below given that you start with 10.0 g of Al and 1
valentinak56 [21]
<span>4 Al + 3 O2 → 2 Al2O3 

(10.0 g Al) / (26.98154 g Al/mol) = 0.37062 mol Al 
(19.0 g O2) / (31.99886 g O2/mol) = 0.59377 mol O2 

0.37062 mole of Al would react completely with 0.37062 x (3/4) = 0.277965 mole of O2, but there is more O2 present than that, so O2 is in excess. 

((0.59377 mol O2 initially) - (0.277965 mol O2 reacted)) x (31.99886 g O2/mol) = 
10.1 g O2 left over</span><span>
</span>
7 0
3 years ago
Read 2 more answers
Ion<br> If we add an electron to a stable element we call it a(n)_____ion<br><br> anion<br> cation
masha68 [24]
The answer is a cation, I may be wrong but cation is plus and anion is subtract
3 0
2 years ago
Two unknown compounds are tested. Compound 1 contains 15.0g of hydrogen and 120.0g of oxygen. Compound 2 contains 2.0g of hydrog
ivann1987 [24]

Answer:

The both compounds are different.

Explanation:

In order to confirm weather both compounds are same we will check the mole ration. If it is same the compounds will be same.

Given data:

For compound 1.

Mass of hydrogen = 15 g

Mass of oxygen = 120 g

Moles of hydrogen and oxygen = ?

Number of moles of hydrogen = 15 g/ 1g/mol = 15 mol

Number of moles of oxygen = 120 g/ 16 g/mol = 7.5 mol

Total number of moles = 22.5 mol

% of hydrogen = 15 /22.5 × 100 = 66.7%

% of oxygen = 7.5 / 22.5× 100 = 33.3%

For compound 2:

Mass of hydrogen = 2 g

Mass of oxygen = 32 g

Moles of hydrogen and oxygen = ?

Number of moles of hydrogen = 2 g/ 1g/mol = 2 mol

Number of moles of oxygen = 32 g/ 16 g/mol = 2 mol

Total number of moles = 4 mol

% of hydrogen = 2 /4 × 100 = 50%

% of oxygen = 2 / 4× 100 = 50%

7 0
2 years ago
A sample of methane gas has a volume of 355 mL at 25.0°C and 2414 mm Hg. If the temperature is raised to 100.°C and the pressure
Drupady [299]

Answer:

23019

Explanation:

5 0
2 years ago
Read 2 more answers
What are characteristics of reliable science?
Mice21 [21]

Answer:

Reliable knowledge is knowledge that has a high probablility of being true because its veracity has been justified by a reliable method. Reliable knowledge is sometimes called justified true belief, to distinguish reliable knowledge from belief that is false and unjustified or even true but unjustified.

4 0
3 years ago
Other questions:
  • A 900.0 mLmL sample of 0.18 MHClO4MHClO4 is titrated with 0.27 MLiOHMLiOH. Determine the pHpH of the solution after the addition
    14·1 answer
  • How does a plants food translate to plant growth (hint: energy is needed for growth)?
    9·1 answer
  • Is a substance that a filter can seperate into two parts a mixture or a pure substance?
    14·1 answer
  • Will give brainliest this is simple plz help
    10·1 answer
  • Is this true or false? :D
    8·2 answers
  • What is the mass in grams of 7.5 x 10^15 atoms of nickel, Ni?
    7·1 answer
  • 100 POINTS!!! ANSWER ASAP
    14·2 answers
  • 15. What are the benefits to having a nuclear power plant nearby?
    7·1 answer
  • What new substance was made after they were mixed
    14·1 answer
  • Mixing baking soda and vinegar is an example of an endothermic reaction. This means...
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!