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fenix001 [56]
3 years ago
11

What is the molar mass of PCL3

Chemistry
1 answer:
antiseptic1488 [7]3 years ago
8 0
The molar mass for PCL3 is 137.33 g/mol
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Which type of mixture can be separated using a sieve?
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D: a heterogeneous mixture with components of varying sizes

Heterogeneous mixture is a combination of substances that doesn't have uniform composition and properties. Just by looking at the mixture you can differentiate the compounds because they are so different. Using a sieve, allows the components with different sizes to separate, while one is retained, the others can pass the holes in the sieve.

Explanation:

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What concentration of benzoic acid will have a ph of 4.0? (for benzoic acid, pka=4.20)?
aalyn [17]
We are given the molar concentration of an aqueous solution of weak acid and the pH ofthe solution, and we are asked to determine the value of Ka for the acid.
The first step in solving any equilibrium problem is to write the equation for the equilibriumreaction. The ionization of benzoic acid can be written as seen in the attached image (1).
The equilibrium-constant expression is the equation number (2)
From the measured pH, we can calculate pH as seen in equation (3)
To determine the concentrations of the species involved in the equilibrium, we imagine that thesolution is initially 0.10 M in HCOOH molecules. We then consider the ionization of the acidinto H+ and HCOO-. For each HCOOH molecule that ionizes, one H+ ion and one HCOO- ionare produced in solution. Because the pH measurement indicates that [H+] = 1x 10^-4 M atequilibrium, we can construct the following table as seen in the equation number (4)
To find the value of Ka, please see equation (5):
We can now insert the equilibrium concentrations into the expression for Ka as seen in equation (6)
Therefore, 2.58x10^-4 M is the concentration of benzoic acid to have a pH of 4.0

7 0
3 years ago
How many ml of a 2.903 M NaOH solution are needed to produce 500.0 ml of a 0.3344M solution?
levacccp [35]

Answer:

57.6ml

Explanation:

Using dilution formula

C1V1 = C2V2

C1 = 2.903 M, V1 = ? , C2 = 0.3344 M , V2 = 500ml

2.903 × V1 = 0.3344 × 500

V1 =( 0.3344 × 500)/ 2.903

= 57.5956

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2 years ago
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The inside layer of skin is the Insulator layer.

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