The answer is C. plasma can conduct electricity but gas can't!
Explanation:
It is known that,
No. of moles = Molarity × Volume
So, we will calculate the moles of as follows.
No. of moles =
= 0.0125 mol
Now, the moles of KOH are as follows.
No. of moles =
= 0.0374 mol
And, =
= 0.0375 mol
Now, the balanced reaction equation is as follows.
This means 1 mole of produces 173.2 kJ of heat. And, the amount of heat produced by 0.0125 moles of is as follows.
M =
= 2.165 kJ
Total volume of the solution = (55.0 + 55.0) ml
= 110 ml
Density of the solution = 1.13 g/ml
Mass of the solution = Volume × Density
=
= 124.3 g
Specific heat = 3.78
Now, we will calculate the final temperature as follows.
q =
2165 J =
2165 - 469.854 =
17.417 =
T =
Thus, we can conclude that final temperature of the solution is .
Answer:
0.8 mL of protein solution, 9.2 mL of water
Explanation:
The dilution equation can be used to relate the concentration C₁ and volume V₁ of the stock/undiluted solution to the concentration C₂ and volume V₂ of the diluted solution:
C₁V₁ = C₂V₂
We would like to calculate the value for V₁, the volume of the inital solution that we need to dilute to make the required solution.
V₁ = (C₂V₂) / C₁ = (2mg/mL x 10mL) / (25 mg/mL) = 0.8 mL
Thus, a volume of 0.8 mL of protein solution should be diluted with enough water to bring the total volume to 10 mL. The amount of water needed is:
(10 mL - 0.8 mL) = 9.2 mL
Half life is 15 hours
so 30 hours would be 2 half lives
after 15 hours it would be at 50%
after 15 more hours it would be at 50% of 50%
so .5 x .5 = .25
it would be 25%
Molality is the moles of solute per kg of solvent.
Moles of NH₄Cl = 2.4 / (14 + 4 x 1 + 35.5)
= 0.0448 mole
Molality = 0.0448 / (19.4 / 1000)
= 2.31 m