how to find number of atoms from grams
The last step we are going to accost in this detail conversion map is the conversion to atoms. Converting between atoms and molecules is much easier than the steps that nosotros have done before. However, it seems to many students because of that they get thrown off and have a difficult time. This conversion is all almost how many of each chemical element are in a particular substance. Cheque out the examples below for a more detailed explanation.
If we wanted to say how many atoms of Br are in NBriii and so we would say 3. Now the simply difference with these conversions is nosotros have to turn that statement into a ratio between the molecule (NBr3) and the cantlet (Br).
| ane NBr3 |
| iii Br |
or
| three Br |
| ane NBr3 |
We can also exercise this for molecules that have only i atom of one element. It only looks kind of silly and so most teachers and books will not show it to you lot. Lets say we had the molecule Ni. How many atoms of Ni are in the molecule of Ni? 1 atom of Ni for every 1 molecule of Ni.
| 1 Ni |
| ane Ni |
or
| one Ni |
| 1 Ni |
Now the higher up may look piddling and painfully obvious simply believe information technology or not a lot of students run into bug with the above ratio and information technology is nix to be aback of. It is hard for people to describe and therefore it is hard for students to understand correctly. In these special cases where there is only ane atom per ane molecule and then y'all don't really need to practice any extra math steps. All the same, I will prove you to them in my demonstrated examples to make sure everyone understands what is going on.
This last footstep in our conversion map is the arrow furthest to the right (the purple text).
VIDEO Converting Betwixt Grams and Atoms Demonstrated Instance 1 : If you accept 12g of CH 4 how many atoms of hydrogen do you take? You lot volition need the periodic tabular array for this question.
Step 1:
What information does the trouble give you?
Answer: 12g CH 4
Step two:
What units does the question ask for?
Answer: ? atoms H
Step 3:
How many conversions must nosotros do?
Reply: Look at the conversion map . We pass through iii arrows when nosotros go from Grams —> Moles —> Molecules —> Atoms. iii arrows = 3 conversion
Stride four:
How do we prepare the problem?
Answer: First box is info given, adjacent 3 boxes are the three conversion, last box (fifth box) is what the question asked for.
| 12 g CH4 | atoms H | |||
| 1 |
Stride 5:
What is the offset conversion?
Respond: molar mass (grams to mole ratio) of CH4 found on the periodic table
Step 6:
What is the molar mass of CH4?
Answer: almost sixteen k/ 1 mol
Step 7:
How exercise we set that up in the conversion?
Answer: units commencement, set up the units that need to cancel out (in red)
| 12 g CH4 | one mol | atoms H | ||
| 16 g |
Stride 8:
What conversion should we use side by side?
Reply: Avogadro's number (moles to molecules ratio) found on the conversion map . half dozen.022 * 10 23 molecules / ane mol
| 12 g CHfour | ane mol | 6.022 * 1023 molec | atoms H | |
| sixteen g | 1 mol |
Step ix:
What conversion should I use next?
Answer: the atom to molecule ratio (4 H to 1 CH 4 )
| 12 k CH 4 | 1 mol | 6.022 * 1023 molec | four atoms H = | atoms H |
| sixteen g | 1 mol | 1 molec CH 4 |
Pace x:
How do I know when I am done with the conversions?
Answer: All other units but the ones in the respond are crossed out through cancellation. For this example atoms and H remain not crossed out.
| 12 1000 CH 4 | one mol | six.022 * 1023 molec | 4 atoms H = | atoms H |
| sixteen g | 1 mol | i molec CH 4 |
Pace 11: Simplify
| 12 | 1 | 6.022 * 1023 | iv atoms H = | atoms H |
| sixteen | 1 | 1 |
Footstep 12:
How do I calculate?
Answer: (12 * half-dozen.022 * ten 23 *4) / (sixteen) = 1.81 * 10 24
Step xiii:
COMPLETE Answer: 1.81 * 10 24 atoms of H
VIDEO Converting Betwixt Grams and Atoms Demonstrated Example 2 : 6.4 * 10 25 atoms of Fe is how many grams of Atomic number 26? You will need the periodic tabular array for this question.
UNFORTUNATELY I AM Not ABLE TO SHOW THIS DEMONSTRATED EXAMPLE ABOVE IN TEXT BECUASE There IS NOT ENOUGH ROOM ON THE WEBPAGE.
PRACTICE PROBLEMS : Complete grams and atoms conversions. Brand sure y'all have this periodic table link open when answering these questions and use the conversion map if you need information technology.
How many F atoms are in 20g of CaF ii ?
Reply: iii.08 * 1023 atoms F
If y'all have 62 grams of Chromium how many atoms is that?
Answer: vii.xviii * x23 atoms Cr
If you have seven.89 * ten25 atoms of Boron how many grams is that?
Answer: one.415 * 10iii g B …or… 1415 g B
How many grams of LitwoS can you lot make from 1.3 * 1024 atoms of Li?
Reply: 49.half-dozen m Li2S
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Source: http://scientifictutor.org/1023/chem-how-to-convert-between-grams-and-atoms/
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