Answer:
V₁ = 31.5 mL
Explanation:
Given data:
Initial molarity = 2.50 M
Initial volume required = ?
Final molarity = 0.150 M
Final volume = 525 mL
Solution:
Formula:
M₁V₁ = M₂V₂
M₁ = Initial molarity
V₁ = Initial volume
M₂ = Final molarity
V₂ = Final volume
Now we will put the values in formula.
2.50 M × V₁ = 0.150 M × 525 mL
V₁ = 0.150 M × 525 mL/ 2.50 M
V₁ = 78.75 M.mL/ 2.50 M
V₁ = 31.5 mL
Remember that density refers to the "mass per unit volume" of an object.
So, if an object had a mass of 100 grams and a volume of 100 milliliters, the density would be 100 grams / 100 ml.
In the question, water on the surface of the scale would add weight, so the mass of the object that you're weighing would appear to be heavier than it really is. If that happens, you'll incorrectly assume that the density is GREATER than it really is
As an example, suppose that there was 5 ml of water on the surface of the scale. Water has a density of 1 gram per milliliter (1 g/ml) so the water would add 5 grams to the object's weight. If we use the example above, the mass of the object would seem to be 105 grams, rather than 100 grams. So, you would calculate:
density = mass / volume
density = 105 grams / 100 ml
density = 1.05 g/ml
The effect on density would be that it would erroneously appear to be greater
Hope this helps!
Good luck
1.)<span>1.5 atm= 1140mm Hg
2.)190mm Hg= .25 atm
3.)253mm Hg= 0.332895 atm
4.).2 atm =152mm Hg
5.)1.5mm Hg= 0.199984 kPa
6.)190mm Hg= 25.3313 kPa
7.)103.2 kPa= 774.06355mm Hg
8.)153mm Hg= 20.3983 kPa
9.)99.8 kPa= </span>0.9849494 atm
Keto-enol tautomerism
<u>Explanation:</u>
Phenolphthalein is an indicator (C₂₀H₁₄O₄), which is utilized to find the volume in the titration of acid and base, Depending on the pH value the indicator, changes its color from colorless in acids to pink in basic medium.
It is a weak acid, losses a (H⁺) proton in solution, that is colorless, whereas the corresponding anion is pink in color.
This change in color of the molecule is not only defined by the addition of a base or an acid, but also with the structure of the indicator, which leads to tautomerism called as keto-enol tautomerism. If a molecule has 2 (-OH) hydroxyl groups as well as 1 (C=O) carbonyl group, exhibit an equilibrium among both the groups. Because of this change, structure of the indicator changes and so color also changes.
Answer:
full moon
Explanation:
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