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# Tutor profile: Sean T.

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Sean T.
Metallurgist/Math-Science Tutor
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## Questions

### Subject:Material Science

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Question:

What is the primary alloying element of steel alloys? What type of lattice position does this element have? Why is carbon such an essential element in steel alloys?

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Sean T.

The primary element in steel alloys is carbon, this element is small enough to fit in between iron molecules and thus fits in a interstitial atomic positions. Carbon is the primary element driver for strength in steel alloys. It controls the phase transformation and hardenability of steel alloys.

### Subject:Chemistry

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Question:

Determine the mass percentage of carbon in the following formula: CH3

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Sean T.

We would first find the total mass of the molecule by referencing the atomic weights(AW) found in the periodic table. Carbon has a AW of 12, and hydrogen has a approximate atomic weight of 1. Since there are 3 hydrogen molecules we would multiply the hydrogen content by 3. By adding the carbon and the three hydrogen atoms we come up with a molecular mass of 12+3=15. Since we want to know the mass percentage of carbon we divide the mass of the carbon by the total mass of the molecule (12/15). This yields a mass percentage of 0.8 or 80%. If we wanted to then know the hydrogen content we would just subtract the 80% from 100% yielding a hydrogen mass percentage of 20%.

### Subject:Algebra

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Question:

Solve the system of equations: 2x+y=5 10x-y=7

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Sean T.

We would add the system of equations since there is one variable that has opposite signs that allow an easy cancellation. The additive solution would be 12x=12. This would yield an answer of x=1. We would then plug the x value back into the equation to solve for y. This would equal 2(1)+y=5 making y=3. We can check the work by plugging both variable into the formulas to see if the values match 2(1)+3=5 and 10(1)-3=7.

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