22. What is the molar mass of oxygen (O2)?A- 15.9994 g/mol
B- 1.204 x 1024 g/mol
C- 6.02 x 1023 g/mol
D- 31.9988 g/mol

Answers

Answer 1

Answer:

Answer:

D- 31.9988 g/mol

Explanation:

The molar mass of a substance is the mass in grams of one mole of the substance. For a compound, the molar mass is the gram - formula mass or gram - molecular weight. It is determined by the addition of its component atomic masses;

To find molar mass of O₂;

Atomic mass of O = 15.9994g/mol

Molar mass of O₂ = 2(15.9994) = 31.9988g/mol

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Calculate the pH of the solution formed when 45.0 mL of 0.100M NaOH solution is added to 50.0 mL of 0.100M CH3COOH (Ka for acetic acid = 1.8 x10-5 ).

Answers

The study of chemicals and bonds is called chemistry. There are two types of elements are there and these rare metals and nonmetals.

The correct answer is 5.59.

What is PH?

pH, historically denoting "potential of hydrogen" is a scale used to specify the acidity or basicity of an aqueous solution.
Acidic solutions are measured to have lower pH values than basic or alkaline solutions

The pH of the solution will be due to excessive acid left and the salt formed. Thus, it will form a buffer solution.

The pH of buffer solution is calculated from Henderson Hassalbalch's equation, which is:

$pH= pka+log(salt)/(acid)$

$pka= -log(ka)$

$pka =-log(1.8*10^(-5)$

The moles of acid are taken as:-

$moles = M*V$

$0.5*50=5$

The moles of the base are taken as:-

$moles = M*V$

$0.1*45=4.5$

moles of acid left is 0.5

Place all the values to the equation:-

$pH=4.74+log(4.5)/(0.5) \n=5.69$

Hence, the correct answer is 5.69.

For more information about the pH, refer to the link:-

brainly.com/question/16759172

Answer:

pH of soltion will be 5.69

Explanation:

The pH of the solution will be due to excessive acid left and the salt formed. Thus, it will form a buffer solution.

The pH of buffer solution is calculated from Henderson Hassalbalch's equation, which is:

$pH=pKa+log(([salt])/([acid]) )$

$pKa=-log(Ka)$

$pKa=-log(1.8X10^(-5))=4.74$

The moles of acid taken :

$moles=molarityXvolume=0.1X50=5mmol$

The moles of base taken:

$moles=molarityXvolume=0.1X45=4.5mmol$

The moles of acid left after reaction :

$5-4.5=05mmol$

The moles of salt formed = 4.5mmol

Putting values in equation

$pH=pKa+log(([salt])/([acid]) )=4.74+log((4.5)/(0.5))=5.69$

Rank the following elements from smallest to
largest atomic radius: Fr, F, Ge, Ru?

Answers

Answer:

1. Flourine, 2 Ruthenium, 3 Germanium, 4 Francium

Explanation:

4, 1, 3, 2 is the order it’ll go in by what you’ve given us

Which of the following characteristics is common to both acids and bases? They produce ions when dissolved in water They absorb oxygen ions when dissolved in water They increase hydrogen ions when dissolved in a solution They increase the hydroxide ions when dissolved in a solution

Answers

Answer:

They produce ions when dissolved in water.

Explanation:

Acids and bases have the characteristic in common to each other. Both of them have the property of reacting and dissolving in the water. Both acids and bases lead to the production of the ions when they are placed in a water solution. Acids produce Hydrogen ions when they are dissolved in water. Bases produce hydroxide ion when they are dissolved in water.

Conventional fossil fuels are harmful to the environment. Alternative solutions include using nuclear energy or solar energy. A decision to opt for solar power over nuclear energy might be based on which of these facts?A) Nuclear energy is highly unreliable and difficult to store.
B) Solar power plants can be easily set up over small tracts of land.
Eliminate
C) Wastes from nuclear power plants are harmful and difficult to manage.
D) Solar energy is independent of season and can be easily trapped and stored.

Answers

Answer:

Explanation:

Wastes from nuclear power plants are harmful and difficult to manage.

Answer:

Explanation:

Answer the following questions about the last lesson below. What did we figure out about chain reactions? What did we figure out about fission? Fission produce more energy than a typical fuel sources, chain reaction