Answer:
![\% Cu=45.2\%\\\\\% Zn=53.6\%\\\\\% Pb=1.2\%](https://tex.z-dn.net/?f=%5C%25%20Cu%3D45.2%5C%25%5C%5C%5C%5C%5C%25%20Zn%3D53.6%5C%25%5C%5C%5C%5C%5C%25%20Pb%3D1.2%5C%25)
Explanation:
Hello!
In this case, given the masses of copper, zinc and lead, it is possible to compute the moles via their atomic masses first:
![n_{Cu}=\frac{91.0gCu}{63.55g/mol}=1.432mol\\\\ n_{Zn}=\frac{111gZn}{65.41g/mol}=1.697mol\\\\n_{Pb}=\frac{7.51gPb}{207.2g/mol}=0.0362mol\\](https://tex.z-dn.net/?f=n_%7BCu%7D%3D%5Cfrac%7B91.0gCu%7D%7B63.55g%2Fmol%7D%3D1.432mol%5C%5C%5C%5C%20n_%7BZn%7D%3D%5Cfrac%7B111gZn%7D%7B65.41g%2Fmol%7D%3D1.697mol%5C%5C%5C%5Cn_%7BPb%7D%3D%5Cfrac%7B7.51gPb%7D%7B207.2g%2Fmol%7D%3D0.0362mol%5C%5C)
Now, we compute the atomic percentages as shown below:
![\% Cu=\frac{1.432}{1.432+1.697+0.0362}*100\% =45.2\%\\\\\% Zn=\frac{1.697}{1.432+1.697+0.0362}*100\%=53.6\%\\\\\% Pb=\frac{0.0362}{1.432+1.697+0.0362}*100\%=1.2\%](https://tex.z-dn.net/?f=%5C%25%20Cu%3D%5Cfrac%7B1.432%7D%7B1.432%2B1.697%2B0.0362%7D%2A100%5C%25%20%3D45.2%5C%25%5C%5C%5C%5C%5C%25%20Zn%3D%5Cfrac%7B1.697%7D%7B1.432%2B1.697%2B0.0362%7D%2A100%5C%25%3D53.6%5C%25%5C%5C%5C%5C%5C%25%20Pb%3D%5Cfrac%7B0.0362%7D%7B1.432%2B1.697%2B0.0362%7D%2A100%5C%25%3D1.2%5C%25)
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The atomic mass is determined by the number of protons and neutrons in a atoms for example oxygen has eight protons and neutrons which gives oxygen and atomic mass of 16
Answer: Light, Thermal, Kinetic
Explanation:
The lamp converts the electric energy to light energy.
The toaster converts the electric energy to thermal energy.
The fan converts the electric energy to kinetic energy.
Good luck with your test!
A molecular structure is a shape of a molecule, a three-dimensional shape or configuration of a molecule that is dependent on the preferred spatial orientation of covalent bonds to atoms having two or more partners. Attached is the diagram for the molecular structure of So42
.