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
mars1129 [50]
3 years ago
5

A certain atom has 26 protons 26 electrons and 30 neutrons. its mass number is

Chemistry
1 answer:
Margaret [11]3 years ago
8 0
26 the mass number is always the proton count
You might be interested in
How does Gregor Mendel's work with pea plants affect human life today? OA A. People continue to cross pea plants to fix Mendel's
lana [24]

Answer:

B

Explanation:

Not sure, but that one makes the most since

4 0
3 years ago
An analytical chemist is titrating of a solution of propionic acid with a solution of 224.9 ml of a 0.6100M solution of propioni
Svetllana [295]

<u>Answer:</u> The pH of acid solution is 4.58

<u>Explanation:</u>

To calculate the number of moles for given molarity, we use the equation:

\text{Molarity of the solution}=\frac{\text{Moles of solute}\times 1000}{\text{Volume of solution (in mL)}}    .....(1)

  • <u>For KOH:</u>

Molarity of KOH solution = 1.1000 M

Volume of solution = 41.04 mL

Putting values in equation 1, we get:

1.1000M=\frac{\text{Moles of KOH}\times 1000}{41.04}\\\\\text{Moles of KOH}=\frac{1.1000\times 41.04}{1000}=0.04514mol

  • <u>For propanoic acid:</u>

Molarity of propanoic acid solution = 0.6100 M

Volume of solution = 224.9 mL

Putting values in equation 1, we get:

0.6100M=\frac{\text{Moles of propanoic acid}\times 1000}{224.9}\\\\\text{Moles of propanoic acid}=\frac{0.6100\times 224.9}{1000}=0.1372mol

The chemical reaction for propanoic acid and KOH follows the equation:

                 C_2H_5COOH+KOH\rightarrow C_2H_5COOK+H_2O

<u>Initial:</u>          0.1372         0.04514  

<u>Final:</u>           0.09206          -                0.04514

Total volume of solution = [224.9 + 41.04] mL = 265.94 mL = 0.26594 L     (Conversion factor:  1 L = 1000 mL)

To calculate the pH of acidic buffer, we use the equation given by Henderson Hasselbalch:

pH=pK_a+\log(\frac{[\text{salt}]}{[acid]})

pH=pK_a+\log(\frac{[C_2H_5COOK]}{[C_2H_5COOH]})

We are given:  

pK_a = negative logarithm of acid dissociation constant of propanoic acid = 4.89

[C_2H_5COOK]=\frac{0.04514}{0.26594}

[C_2H_5COOH]=\frac{0.09206}{0.26594}

pH = ?  

Putting values in above equation, we get:

pH=4.89+\log(\frac{(0.04514/0.26594)}{(0.09206/0.26594)})\\\\pH=4.58

Hence, the pH of acid solution is 4.58

7 0
3 years ago
The first law of thermodynamics is a restatement of the
klasskru [66]

the law of thermodyanamic is the restatement of the law of conservation of energy

4 0
3 years ago
You measure the strange insect in your yard and determine that it's 10 cm long. You want to share this new insect with other sci
blagie [28]

Answer:

A. SI units allow scientists to communicate around the world using the same

system of measurement.

Explanation:

4 0
2 years ago
Which is the molar mass of H2O?
Svetllana [295]
H=(2x1.008)=2.016
O= 15.999

15.999
+ 2.016
______
18.015 g/mol :)

3 0
2 years ago
Read 2 more answers
Other questions:
  • What volume will 2.0 moles of nitrogen occupy at .947atm and 20° C?
    8·1 answer
  • g a solid organic waste (generic formula: C) is degraded by CO2 by microbial processes. Does this mean C is getting oxidized
    14·1 answer
  • NEED HELP FAST!20 pts for an easy worksheet
    10·1 answer
  • How many molecules of H2O are there in 1.0 g of H20
    8·1 answer
  • Francium has the largest atomic radius. Why might this be?
    7·1 answer
  • PLZ HELP ME WITH MY WORK​
    5·1 answer
  • Which methods could be used to dilute a solution of sodium chloride
    13·1 answer
  • Flowers are vascular plants.
    6·2 answers
  • 7. Allicin, C6H65,0, is the compound that gives garlic its odor. A sample of allicin contains 3.0 X 1021 atoms of carbon. How ma
    6·1 answer
  • A gas at STP has a volume of 1.00 L. If the pressure is doubled and the temperature remains constant, what is the news of the ga
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!