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
Thepotemich [5.8K]
3 years ago
5

HURRYYY!!!! Convert 7.13 x 10^28 atoms of calcium (Ca) to moles of calcium.

Chemistry
1 answer:
puteri [66]3 years ago
4 0

Answer:

<h2>118,438.5 moles</h2>

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

n =  \frac{N}{L}\\

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

n =  \frac{7.13 \times  {10}^{28} }{6.02 \times  {10}^{23} }  \\  = 118438.538...

We have the final answer as

<h3>118,438.5 moles</h3>

Hope this helps you

You might be interested in
NH4NO3, whose heat of solution is 25.7 kJ/mol, is one substance that can be used in cold pack. If the goal is to decrease the te
makvit [3.9K]

Answer:

There are necessaries 35,2g of NH₄NO₃ per 100,0g of water to decrease the temperature of the solution from 25,0°C to 5,0°C

Explanation:

To decrease the temperature of the solution there are necessaries:

4,184J/g°C×(5,0°C-25,0°C)×(100,0g+X) = -Y

8368J + 83,68J/gX = Y <em>(1)</em>

Where x are grams of NH₄NO₃ you need to add and Y is the energy that you need to decrease the heat.

Also, the energy Y will be:

Y = 25700J/mol×\frac{1mol}{80,043g}X

Y = 321J/g X <em>(2)</em>

Replacing (2) in (1)

8368J + 83,68J/g X = 321J/g X

8363J = 237,32J/gX

<em>X = 35,2g</em>

<em />

Thus, there are necessaries 35,2g of NH₄NO₃ per 100,0g of water to decrease the temperature of the solution from 25,0°C to 5,0°C

I hope it helps!

6 0
3 years ago
Water contrasts on freezing ?
Airida [17]

No. When water first begins to cool down, it contracts. However, as it gets colder and eventually freezes, it begins to expand.

You can test this by freezing water in a water bottle: when you take it out of the freezer, the cap might have popped off or cracks may have formed in the sides of the bottle.

Answer: Water expands when frozen, not contracts.

8 0
3 years ago
HELP ASAP 10 POINTS
TEA [102]

Answer:

the answer is destructive interference

4 0
3 years ago
What property is used to organize elements on the periodic table?
erma4kov [3.2K]
Atomic Number is used to organize the periodic table.

Hope this helps
3 0
3 years ago
How many moles are in 158 grams of LiCl
Usimov [2.4K]

Answer:

Number of moles = 3.73 mol

Explanation:

Given data:

Mass of LiCl = 158 g

Number of moles = ?

Solution:

Formula:

Number of moles = mass/ molar mass

Molar mass of LiCl = 42.4 g/mol

Number of moles =  158 g / 42.4 g/mol

Number of moles = 3.73 mol

7 0
3 years ago
Other questions:
  • A red shift in the spectrum of the light from an object indicates the object is moving ____ you.
    7·1 answer
  • PLEASE HELP, 99 POINTS When an electric current is passed through water during the process of electrolysis two gases are formed
    10·2 answers
  • SUSTANTIVO FORMA TAMANO CO
    12·1 answer
  • Problem Page Gaseous butane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Supposed 8.14 g
    12·1 answer
  • Which quantity of heat is equal to 200. joules
    13·1 answer
  • A 10.0g sample of H2O(l) at 23.0degrees C absorbs 209 joules of heat. What is the final temp of the H2O(l) sample? Explain.
    5·1 answer
  • Potassium hydrogen phthalate, KHC8H5O4, or KHP, is used in many laboratories, including general chemistry laboratories, to stand
    15·1 answer
  • Pls help
    5·1 answer
  • Summarize tornado in 6 words:
    12·2 answers
  • How does the law of conservation of energy apply to the changes in potential and kinetic energy of a pencil as it falls to the f
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!