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
mamaluj [8]
3 years ago
9

Catalase (a liver enzyme) dissolves in water. A 14mL solution containing 0.166g of catalase exhibits an osmotic pressure of 1.2

Torr at 20°C. What is the molar mass of catalase?
Chemistry
1 answer:
nignag [31]3 years ago
7 0

Answer:

The correct answer is 180,424 g/mol

Explanation:

The expression for osmotic pressure (π) is the following:

π= i x M x R x T

Where M is the molarity of the solution, R is the gas constant and T is the temperature.

i= 1 because the catalase is a nonelectrolyte.

M= m/(VxMW) because the molarity is in mol/L and mol is obtained by the mass (m) divided into the molecular weight (MW)

We introduce this expression in the expression for osmotic pressure and we obtain:

π= \frac{m  R  T }{V  MW}

T= 20ºc= 293 K

V= 14 mL= 0.014 L

So, we directly calculate the molecular weight as follows:

MW= \frac{m  R T}{V   \pi }

MW= (0.166 g)(0.082 LatmK⁻¹mol)(293 K) (760Torr atm⁻¹)/(0.014 L)(1.2 Torr)

MW= 180,424 g/mol

For an enzyme: 180,424 g/mol= 180.4 kDa (because 1 g/mol= 1 Da)

You might be interested in
Determine the electrical work required to produce one mole of hydrogen in the electrolysis of liquid water at 298°K and 1 atm. T
Ostrovityanka [42]

Explanation:

The given data is as follows.

          \Delta H = 286 kJ = 286 kJ \times \frac{1000 J}{1 kJ}

                            = 286000 J

 S_{H_{2}O} = 70 J/^{o}K,      S_{H_{2}} = 131 J/^{o}K

 S_{O_{2}} = 205 J/^{o}K

Hence, formula to calculate entropy change of the reaction is as follows.

          \Delta S_{rxn} = \sum \nu_{i}S_{i}_(products) - \sum \nu_{i}S_{i}_(reactants)

                     = [(\frac{1}{2} \times S_{O_{2}}) - (1 \times S_{H_{2}})] - [1 \times S_{H_{2}O}]

                    = [(\frac{1}{2} \times 205) + (1 \times 131)] - [(1 \times 70)]

                    = 163.5 J/K

Therefore, formula to calculate electric work energy required is as follows.

             \Delta G_{rxn} = \Delta H_{rxn} - T \Delta S_{rxn}

                            = 286000 J - (163.5 J/K \times 298 K)

                            = 237.277 kJ

Thus, we can conclude that the electrical work required for given situation is 237.277 kJ.

6 0
3 years ago
Which is an element? ... air ...carbon dioxide ...hydrogen ...water Description
Natalka [10]
All Elements are obtained in the periodic table & water is Not an element it is a compound.
5 0
3 years ago
Read 2 more answers
When lewis structures are drawn, do you only show valence electrons??
Lynna [10]
Yes you do cause its more explanation to
 <span />
8 0
3 years ago
Sodium thiosulfate, na2s2o3, is used as a "fixer" in black and white photography. identify the reducing agent in the reaction of
aev [14]
Answer is: reducin agent in this reaction is thiosulfate (S₂O₃²⁻).
Balanced chemical reaction: 2S₂O₃²⁻(aq) + I₂(aq) → S₄O₆²⁻(aq) + 2I⁻<span>(aq).
Reducing agent is element or compound who loose electrons in chemical reaction. Sulfur in </span>thiosulfate change oxidation number from +2 to +5 tetrathionate anion (two<span> sulfur </span>atoms in the ion have oxidation state<span> 0 and two atoms have oxidation state +5).</span>
8 0
3 years ago
Why do so many tornadoes occur in tornado alley
Shtirlitz [24]
<span>

The conditions in tornado alley are more favorable. In the summer, the plains of middle US get increasingly hot which in turn, cause updrafts as well as thunderstorms. When hot air becomes unstable and rises it meets cooler air above the thunderclouds, which causes tornadoes.</span>
5 0
3 years ago
Read 2 more answers
Other questions:
  • What is the name of the compound PbS2 • 4H2O?
    12·1 answer
  • State two differences between metals and non metals with respect to their
    10·1 answer
  • The most highly concentrated hydrochloric acid is 12 M. What volume of a 12 M stock solution of HCL should be diluted in order t
    8·1 answer
  • When 14.8 g KOH is dissolved in 85.6 g of water in a coffee-cup calorimeter, the temperature rises from 19.3 °C to 32.76 °C. Wha
    8·1 answer
  • Which statement best describes a chemical reaction?
    13·1 answer
  • A soluble iodide was dissolved in water. Then an excess of silver nitrate, AgNO3, was added to precipitate all of the io- dide i
    14·1 answer
  • What is the mass of an object that is accelerated 4 m/s2 by a force of 180 N?<br> kg<br> Asap!!!!!!!
    5·2 answers
  • What do nucleic acids and phospholipids have in common?
    11·1 answer
  • If bald people work in a restaurant, do they still need to wear a hairnet?<br> Please help
    13·2 answers
  • A 0.15 M NaOH solution has a volume of 0.125 L but is then diluted to 0.15 L. What is the concentration of the new solution
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!