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
Romashka [77]
3 years ago
12

How many cu atoms are present in a piece of sterlingsilver jewelry weighing 33.24 g ? (sterling silver is a silver–copper alloy

containing 92.5% ag by mass.)?
Chemistry
1 answer:
emmasim [6.3K]3 years ago
8 0

The mass of piece of sterling silver jewelry is 33.24 g. It contains 92.5% silver Ag by mass. Since, sterling silver is an alloy of Ag-Cu thus, percentage of Cu will be:

% Cu=100-92.5=7.5%

Thus, mass of copper will be:

m_{Cu}=\frac{7.5}{100}\times 33.24 g=2.493 g

Molar mass of Cu is 63.546 g/mol, thus, number of moles of Cu can be calculated as follows:

n=\frac{m}{M}

Here, m is mass and M is molar mass.

Putting the values,

n=\frac{2.493 g}{63.546 g/mol}=0.03923 mol

Now, in 1 mole of Cu there are 6.303\times 10^{23}atoms thus, in 0.03923 mol, number of Cu atoms will be:

0.03923 mol\times 6.303\times 10^{23}atoms=2.363\times 10^{22} atoms

Thus, number of atoms of Cu will be2.363\times 10^{22} atoms.


You might be interested in
What makes noble gases stable?
inn [45]
The correct answer to your question is noble gases are stable <span>due to having the maximum number of valence electrons their outer shell can hold. Meaning their outer shells are stable. 

Hope this helps let me know!</span>
8 0
3 years ago
A(n) ________ is a device that measures a change in speed
jok3333 [9.3K]

Answer:

C Accelerometer

Explanation:

An accelerometer is an electromechanical device used to measure acceleration forces. Such forces may be static, like the continuous force of gravity or, as is the case with many mobile devices, dynamic to sense movement or vibrations. Acceleration is the measurement of the change in velocity, or speed divided by time.

Hpoe this Helps!

5 0
3 years ago
Read 2 more answers
What happens when a parking lot is built in a wetlands area?
Airida [17]
The ground could sink and sink holes could occur, otherwise the parking lot could simply break apart and wear faster
5 0
3 years ago
Read 2 more answers
Discuss how the following factors determine the rate of electron transfer in biological systems:
Cloud [144]

Answer:check explanation

Explanation:

(a). HOW THE DISTANCE BETWEEN ELECTRON DONOR AND ACCEPTOR AFFECTS THE RATE OF ELECTRON TRANSFER IN BIOLOGICAL SYSTEM:

Distance between the acceptor and the donor can affect in two ways; short distance and long distance effect.

Short distance causes

electronic orbitals of donor and acceptor directly overlap whereas in LONG DISTANCE reactions this coupling is indirect because of

sequential overlaps of atomic orbitals of the donor, the intervening medium, and the orbitals of the acceptor.

(b). HOW REORGANIZATION ENERGY OF REDOX ACTIVE SPECIE SURROUNDING MEDIUM AFFECTS:

the reorganized energy does not depend on the pre-existing intra molecule electric field. The charge transferred inside the molecule interacts with its aqueous surroundings.

Reorganized energy can be calculated using Poisson-Boltzmann equation.

3 0
3 years ago
Two plates slide past each other in opposite directions at a ____ boundary.
Kitty [74]

Answer: plate

Explanation: Plates grinding past each other in opposite directions create faults called transform faults. Powerful earthquakes often strike along these boundaries. The San Andreas Fault is a transform plate boundary that separates the North American Plate from the Pacific Plate.

4 0
3 years ago
Read 2 more answers
Other questions:
  • The nucleus contains both protons and electrons True or false
    6·1 answer
  • A car with a mass of 1360 kg accelerate from 120 m/s 2 to 520 m / s in 8 seconds.what is the acceletation of the car
    6·1 answer
  • You will be climbing a mountain with very high elevation. What instrument should you bring along to determine the atmospheric pr
    11·2 answers
  • Rank these molecules or groups of molecules by when mammals use them as fuel, from right after a meal through only during starva
    11·1 answer
  • What is 6.24x10^-4 in regular numbers
    12·1 answer
  • Determine the volume of fluid in the graduated cylinder 12.8ml 12.7ml 12.78ml 12.88
    12·1 answer
  • What may happen to the electron when it loses its energy?
    13·2 answers
  • What is the net ionic equation for the following? :)
    15·1 answer
  • How much energy is released when carbon dioxide is created
    12·2 answers
  • Select the equality for the following: 1 L is 1.06 QT
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!