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
crimeas [40]
3 years ago
5

What is the number of moles of Sodium Chloride (NaCl) that is present in 29.22g sample of it?

Chemistry
2 answers:
kodGreya [7K]3 years ago
5 0

Answer:

\boxed {\boxed {\sf 0.5000 \ mol \ NaCl}}

Explanation:

We are asked to convert grams to moles. We must use the molar mass or the grams in 1 mole of a substance. These values are found on the Periodic Table as the atomic mass, but the units are grams per mole (g/mol) instead of atomic mass units (amu).

We are given the compound sodium chloride or NaCl. Look up the molar masses of the individual elements.

  • Na:  22.9897693 g/mol
  • Cl: 35.45 g/mol

The formula for the compound does not contain any subscripts, so there is 1 mole of each element in 1 mole of the compound. Add the molar masses together to find sodium chloride's molar mass.

  • NaCl: 22.9897693 + 35.45= 58.4397693 g/mol

Now we can use the molar mass to create a ratio. We know there are 58.4397693 grams of NaCl in 1 mole of NaCl.

\frac {58.4397693  \ g \ NaCl}{ 1 \ mol \ NaCl}

Multiply by the number of grams provided in the problem: 29.22

29.22 \ g\ NaCl*\frac {58.4397693  \ g \ NaCl}{ 1 \ mol \ NaCl}

Flip the ratio so the units of grams of NaCl cancel.

29.22 \ g\ NaCl*\frac { 1 \ mol \ NaCl}{58.4397693  \ g \ NaCl}

29.22*\frac { 1 \ mol \ NaCl}{58.4397693}

\frac {29.22}{58.4397693}  \ mol \ NaCl

0.5000019738 \ mol \ NaCl

The original measurement of grams has 4 significant figures, so our answer must have the same. For our answer, that is the ten-thousandth place. The 0 to the right of this place (0.5000019738) tells us to leave the 0 in the ten-thousandth place.

0.5000 \ mol \ NaCl

There are approximately <u>0.5000 moles of sodium chloride in a 29.22 gram sample of sodium chloride.</u>

Liula [17]3 years ago
3 0
There are 0.5 moles of NaCl present in a 29.22g sample.

to find moles of a compound you would look at the periodic table to find the mass. in this case, the mass of NaCl is 58.44 g/mol. now, you divide the sample mass of 29.22g by 58.44 g/mol. the grams will cancel each other out and you’re left with 0.5 mol in that sample

hope this helps!
You might be interested in
I've been waiting for like 10 mins. Please answer this.
Degger [83]

The answer is B. 6CO2+H2O yields C6H12O6+ 6H20.

3 0
2 years ago
Read 2 more answers
The
Marat540 [252]

Answer:

Isotopes

Explanation:

Isotopes are atoms of the same element that contain an identical number of protons, but a different number of neutrons. Despite having different numbers of neutrons, isotopes of the same element have very similar physical properties.

4 0
3 years ago
What volume of 0.585 m ca(oh)2 would be needed to neutralize 15.8 l of 1.51 m hcl?
SpyIntel [72]
When the balanced reaction equation is:

2HCl(aq) + Ca(OH)2(aq) → CaCl2(aq) + 2H2O(l)

from the balanced equation, we can get the molar ratio between HCl & Ca(OH)2

2:1

∴ the volume of Ca(OH)2 = 15.8 L HCl * 1.51 m HCl * (1mol Ca(OH)2/ 2mol HCl) *                                           (1L ca(OH)2/0.585 mol Ca(OH)2 

                                          = 20.4 L
8 0
3 years ago
Select the correct answer from the drop-down menu. a scientist digs up sample of arctic ice that is 458,000 years old. he takes
Jlenok [28]

The original mass of krypton 81 that is present in the ice is 6.70 grams.

<h3>How do we calculate original mass?</h3>

Original mass of any substance will be calculated as below for the decomposition reaction is:

N = N₀(1/2)ⁿ, where

N = remaining mass of krypton-81 = 1.675g

N₀ = original mass of krypton-81 = ?

n will be calculated as:
n = T/t, where

T = total time period = 458,000 years

t = half life time = 229,000 years

n = 458,000/229,000 = 2

Now putting all these values on the above equation, we get

N₀ = 1.675 / (1/2)²

N₀ = 6.70 g

Hence required mass is 6.70 g.

To know more about half life time, visit the below link:
brainly.com/question/2320811

8 0
2 years ago
If an atom has the same equal amount of electron and proton is it charged or uncharged ​
Doss [256]

Answer:

Neutral or uncharged

Explanation:

The positive charge on a proton is equal in magnitude to the negative charge on an electron. As a result, a neutral atom must have an equal number of protons and electrons.

3 0
2 years ago
Read 2 more answers
Other questions:
  • What could you do to change the volume of a gas?
    5·2 answers
  • Explain Boyle's &amp; Charles's law.
    12·1 answer
  • What is an electrolyte in an electrochemical cell?
    5·2 answers
  • ΔG o for the reaction H2(g) + I2(g) ⇌ 2HI(g) is 2.60 kJ/mol at 25°C. Calculate ΔG o , and predict the direction in which the rea
    14·1 answer
  • Which organism on the food chain is a carnivore? fungus grass grasshopper spider
    8·1 answer
  • What percentage of gases are in the earth?
    11·1 answer
  • Need help now! WRITER: Explain how ferns and fungi are different.
    15·1 answer
  • Could someone explain how they got this answer, explain step by step plz
    14·1 answer
  • If heat transfers from the system (solute) to the surroundings (solvent), then AH is
    6·1 answer
  • Gold can be found in native or pure state in nature why? Write any one anyone application of sulphur​
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!