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
xz_007 [3.2K]
2 years ago
6

A chemist obtains a sample of

Chemistry
1 answer:
djverab [1.8K]2 years ago
7 0

The number of formula units of Na₂SO₄ present in the sample is 3.01×10²³ units

<h3>Avogadro's hypothesis </h3>

From Avogadro's hypothesis,

1 mole of Na₂SO₄ = 6.02×10²³ units

But

1 mole of Na₂SO₄ = (23×2) + 32 + (16×4) = 142 g

Thus,

142 g of Na₂SO₄ = 6.02×10²³ units

<h3>How to determine the units in 71 g of sample </h3>

142 g of Na₂SO₄ = 6.02×10²³ units

Therefore,

71 g of Na₂SO₄ = (71 × 6.02×10²³) / 142

71 g of Na₂SO₄ = 3.01×10²³ units

Thus, 3.01×10²³ units of Na₂SO₄ is present in the sample

Learn more about Avogadro's number:

brainly.com/question/26141731

You might be interested in
Based on the chemical equation, use the drop-down menu to choose the coefficients that will balance the chemical equation:
Leni [432]

Answer: (1)CaSO4 -> (2)O2 + (1)CaS

Explanation: edge 2020 chem

5 0
2 years ago
Which statement best describes the pH of pure water?
Ray Of Light [21]

The pH of pure water is neutral because the concentration of hydronium ions equals that of hydroxide ions.

Answer: Option A

<u>Explanation:</u>

Water is one of the most important constituents of living being. It is said that there is no life without water. So that water need to neutral in nature to save life. Pure water is composed of hydronium H^{+} and hydroxide \left(O H^{-}\right) ions. It is known that hydronium ions are acidic in nature with concentration of 1 \times 10^{-7} \mathrm{M} / \mathrm{L}.

Similarly, the hydroxide ions which are basic in nature will be in same concentration as that of hydronium ions. So, as the concentration of basic and acidic elements are equal with the same strength of pH, the combination of these ions lead to formation of pure water with the pH being neutral.

7 0
3 years ago
Read 2 more answers
Phosphorus-32 is radioactive and has a half life of 14.3 days. What percentage of a sample would be left after 12.6 days
nadya68 [22]

Answer:

There is 54.29 % sample left after 12.6 days

Explanation:

Step 1: Data given

Half life time = 14.3 days

Time left = 12.6 days

Suppose the original amount is 100.00 grams

Step 2: Calculate the percentage left

X = 100 / 2^n

⇒ with X = The amount of sample after 12.6 days

⇒ with n = (time passed / half-life time) = (12.6/14.3)

X = 100 / 2^(12.6/14.3)

X = 54.29

There is 54.29 % sample left after 12.6 days

8 0
2 years ago
What is 2n2 formula? ​
allsm [11]

Answer:The distribution of electrons in an atom is called as Electronic Configuration. Formula 2n2 helps in the determination of the maximum number of electrons present in an orbit, here n= orbit number.

Explanation:

5 0
2 years ago
How can you use knowledge of a minerals chemical makeup or use?
mel-nik [20]

and D. to identify minerals

8 0
3 years ago
Read 2 more answers
Other questions:
  • Please make the following calculation and round your
    7·1 answer
  • Select all that apply to physical and chemical properties ?
    9·2 answers
  • Choose the pure substance from the list below. choose the pure substance from the list below. lemonade wine air juice salt
    5·1 answer
  • What is the mass of 2.40 moles of magnesium chloride, mgcl2
    11·1 answer
  • Why are electrolytes so important?
    14·1 answer
  • Which of the following ions would represent the ion of an element from group 2A
    15·1 answer
  • If a molecule diffusing through extracellular fluid travels 1 mm in 1 sec, how long will it take that molecule to diffuse 1 cm?
    13·1 answer
  • How can the percent yield be used to determine the actual yield of a chemical reaction
    9·1 answer
  • How much of a sample remains after five half-lives have occurred?
    7·1 answer
  • Help me rn plz......​
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!