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oksian1 [2.3K]
3 years ago
11

How am i able to answer this?

Chemistry
1 answer:
ratelena [41]3 years ago
7 0
Whats the question so i can answer

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What is the formula for percent yield
Sindrei [870]
I think it is 89.3%?
3 0
3 years ago
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
A gas occupies 2.50 L at 1.5 atm. What will be the volume of this gas if the
sashaice [31]

Answer:

2.08 L

Explanation:

V_{2}  = V_{1} (\frac{P_{2} }{P_{1} })

= 2.50L × (\frac{1.25 atm}{1.5 atm} )

=2.08L

8 0
2 years ago
Write the chemical symbol for the ion<br> with 33 protons and 36 electrons
Rashid [163]
  • We cannot change protons of any element
  • So the atomic number is 33
  • The element is Arsenic(As)

Now here is 36 electrons so it's. tri cation.

Symbol

\\ \tt\hookrightarrow As^{3+}

5 0
2 years ago
A 3.0 L cointainer contains 4 mol He, 2 mol Ne,and 1 mol Ar. What is the mole fraction of neon gas? What is the partial pressure
CaHeK987 [17]

Answer:

Partial pressure of Ne = 1.43 atm

Explanation:

Step 1: Data given

Volume = 3.0 L

Number of moles He = 4 moles

Number of moles Ne = 2 moles

Number of moles Ar = 1 mol

Total pressure = 5 atm

Step 2: Calculate total moles

Total moles = 4 moles + 2 moles + 1 mol

Total moles = 7 moles

Step 3: Calculate the mol ratio

Mol ratio = moles / total mol

Mol ratio He = 4 moles / 7 moles = 0.571

Mol ratio Ne = 2 moles / 7 moles = 0.286

Mol ratio Ar = 1 mol / 7 moles = 0.143 moles

Ste p4: Calculate partial pressure

PArtial pressure = mol ratio * total pressure

Partial pressure of Ne = mol ratio Ne * total pressure

Partial pressure of Ne = 0.286 * 5 atm

Partial pressure of Ne = 1.43 atm

8 0
3 years ago
Read 2 more answers
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