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
Rashid [163]
4 years ago
14

Calculate the number of moles in 2.5 grams of potassium chloride. Show all the steps.

Chemistry
1 answer:
Rufina [12.5K]4 years ago
6 0
3.4 X 10^-2 because you start your equation with 2.5g in your (what we call train tracks). Then you have to find the GFM (gram formula mass) of KCl (potassium chloride). You find this by adding the average atomic mass of each element. Potassium's is 39.10 and Chlorine's is 35.45 which gives you a total of 74.55 grams per mol. so now that you have found the GFM you plug that number into the diagonal bottom in order to cancel the gram units. Then you would place 1 mol KCl on top because that is the unit you want. Finally you will divide your original 2.5 by the GFM of 74.55 to get an answer of 0.033534 mol KCl... but since sig figs matter your final  answer will be 3.4 X 10^-2
You might be interested in
Describe relationship between frequency, wavelength, and energy as you move up and down the spectrum.
nadya68 [22]
When frequency increases more wave crests pass a fixed point each second. That means the wavelength shortens. So, as frequency increases, wavelength decreases. The opposite is also true.... as frequency decreases, wavelength increases.
3 0
3 years ago
Meaning of rust and rusting​
Yuki888 [10]

Answer:a reddish- or yellowish-brown flaky coating of iron oxide that is formed on iron or steel by oxidation, especially in the presence of moisture.

Explanation: so basically rusting happens when a metal comes in contact with moisture and air, at a brown, dirty metal coat forms on it.

7 0
2 years ago
Read 2 more answers
What events caused the formation of most islands in the South Pacific?
Svetach [21]
The answer is D. Because most islands have dormant volcanoes
4 0
3 years ago
Is a small whole number that appears in front of a formula in a chemical equation?
Bezzdna [24]
No. It appears behind the equation
4 0
3 years ago
How many moles of carbon are in 7.87*10^7
elena-14-01-66 [18.8K]
Well one mole of stuff, any stuff, including carbon dioxide, specifies
6.022
×
10
23
individual items of that stuff.
Explanation:
And thus we work out the quotient:
7.2
×
10
25
⋅
carbon dioxide molecules
6.022
×
10
23
⋅
carbon dioxide molecules
⋅
m
o
l
−
1
≅
120
⋅
m
o
l

carbon dioxide
.
This is dimensionally consistent, because we get an answer with units
1
m
o
l
−
1
=
1
1
mol
=
m
o
l
as required.
6 0
3 years ago
Other questions:
  • What mass of carbon dioxide is produced from the complete combustion of 4.50×10−3 g of methane?
    7·1 answer
  • Place the following substances in order of increasing vapor pressure at a given temperature.
    14·1 answer
  • What has to happen for a feather and a ball to fall at the same rate
    8·1 answer
  • Si el número atómico del Flúor es 9 y su masa atómica 19, ¿cuántos electrones, protones y neutrones, tiene? Justifique con formu
    11·1 answer
  • How many liters of a 3.5 M solution are needed to make 500 mL of a 1.3 M solution?
    14·1 answer
  • A molecule has four unshared electrons on the central atom and four chlorine atoms bonded to the central atom. What is its molec
    12·1 answer
  • Question 3After creating a Beer's Law plot using standard solutions of Q, you determined the slope of Beer's Law to be 0.515 M-1
    8·1 answer
  • Movement along the San Andreas Fault causes: <br> earthquakes <br> folding <br> magma
    15·2 answers
  • Why is think chemistry is important? i need 5 paragraph please
    13·1 answer
  • 2. List and explain the three steps for solving a numeric problem.
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!