Find Number of Neutrons in a Copper Bar given volume of bar?

AI Thread Summary
To find the number of neutrons in a copper bar, first calculate its volume in cubic centimeters, which is 11.37 cm³, and then use the density of copper (8.921 g/cm³) to find the mass of the bar, resulting in approximately 101.3 grams. The average atomic mass of copper is 63.546 g/mol, which accounts for its isotopes, 63Cu and 65Cu. By using Avogadro's number (6.022 x 10²³), the number of atoms in the copper bar can be determined. The calculation should incorporate the weighted average of the isotopes to find the correct number of neutrons, leading to a more accurate result. The isotope information is essential for precise calculations regarding the neutrons in the copper sample.
viper2308
Messages
18
Reaction score
0
Homework Statement

A bar of copper has dimensions 0.5605 ft. x 3.545 in x 5.722 cm. The density of copper is 8.921 g / cm3. Copper contains 2 isotopes, 63Cu (69.09% abundant) and 65Cu (30.91% abundant). How many neutrons are in the bar of copper?

The attempt at a solution

I took the volume: 11.37cm^3 x 8.921g/cm^3 x 6.022E23 neutrons/63.546g Cu = 9.612E23 neutrons.

Is this right? I think I need to use the isotope information somewhere but I don't know where or how.
 
Physics news on Phys.org
You have already used the isotope information, 63.546g is the weighted average of the two isotopes
 
Ok I just got the from the periodic table. So the isotope information is unnecessary?
 
>63Cu (69.09% abundant) and 65Cu (30.91% abundant)
Means that a sample = 63 * 69.09/100 + 65 * 30.91/100 = 63.618
You should probably use this value in your calcs.
 

Thread 'Prove that evolution is constant (Provide at least two arguments to support your position)'

I don't get how to argue it. i can prove: evolution is the ability to adapt, whether it's progression or regression from some point of view, so if evolution is not constant then animal generations couldn`t stay alive for a big amount of time because when climate is changing this generations die. but they dont. so evolution is constant. but its not an argument, right? how to fing arguments when i only prove it.. analytically, i guess it called that (this is indirectly related to biology, im...
View full post »
Thread 'How to find the pH of a galvanic cell (MIT OCW problem set)'

Thread 'How to find the pH of a galvanic cell (MIT OCW problem set)'

This is the final problem in this problem set from MIT OCW. Here is what I did to try to solve it The table cited in the problem is below We can easily spot the two redox couples that are in the electrochemical cell we are given. The hydrogen-based electrode has standard potential zero, and the silver-based electrode has standard potential 0.22. Thus, the hydrogen electrode, with the lower potential, is the reducing agent (ie, it is where oxidation happens) and is the anode. Electrons...
View full post »

Similar threads

Chemistry How to Convert a Number Concentration into Volume Mixing Ratio?
Replies
3
Views
3K
I Extremely strange consequence of the speed of heat value
Replies
19
Views
2K
Number of free conduction electrons in a segment of wire
Replies
2
Views
1K
MHB Find the volume of the hexagonal-shaped plastic box
Replies
4
Views
1K
What Volume of Copper Sulfate Solution is Needed for 1.110g of Iron?
Replies
29
Views
21K
Density: Cube of Aluminum to Copper Sphere
Replies
3
Views
5K
Neutron absorbed by a sheet of indium, % chance
Replies
10
Views
2K
Finding number of atoms and volume
Replies
3
Views
13K
Mass, density, volume: Find the volume of an alloy
Replies
14
Views
16K
How do I convert meters cubed to cubic centimeters?
Replies
4
Views
2K

Hot Threads

Recent Insights

Back
Top