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Tutor profile: Aatreyee S.

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Aatreyee S.
In teaching and research field for 7 years
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Questions

Subject: Material Science

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Question:

What is the type of solid solution (a) copper and nickel (b) Iron and carbon

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Aatreyee S.
Answer:

(a) copper and nickel Cu-Ni forms a substitutional solid solution. If a melt of Cu and Ni with any composition is cooled, a solid solution begins to freeze out. This solid solution is richer in Ni than the liquid solution. As the two-phase system of the solid plus melt is cooled further, the mole fraction of Ni decreases in both the solid solution and the liquid melt. (b) Iron and carbon Fe-C forms an interstitial solid solution; the C atoms occupy interstices in the crystal structure of substance Fe. The Fe-Fe3C is characterized by five individual phases. Five phases that exist in the Fe-C diagram are:α –ferrite (BCC) Fe-C solid solution,γ-austenite (FCC) Fe-C solid solution,δ -ferrite (BCC) Fe-C solid solution, Fe3C (iron carbide)or cementite - an intermetallic compound and liquid Fe-C solution.

Subject: Pre-Algebra

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Question:

If x <2, then simplify, |x - 2| - 4|-6|

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Aatreyee S.
Answer:

If x < 2 then x - 2 < 0 and if x - 2 < 0 then |x - 2| = - (x - 2). Substitute |x - 2| by - (x - 2) and | - 6 | by 6 |x - 2| - 4| -6 | = - (x - 2) - 4(6) = - x - 22

Subject: Basic Chemistry

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Question:

A solution made from ethanol and water is 1.75 molar (M) in ethanol. How many grams of ethanol are contained per 250 grams of water?

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Aatreyee S.
Answer:

Firstly we need to know the concept of Molarity (M). Molarity (M) is a measure of the concentration of a solution. It measures the moles of solute per liter of solvent. A solute is a molecule in lesser quantity and the solvent is the molecules the solute is dissolved in. Now there are 20.15g of ethanol in 250g of water in a 1.75M solution of ethanol. To solve this problem, we first need to calculate how many moles of ethanol are in 250g based on the molarity. You can set up a stoichiometry ratio like this: 250g water (1.75 mole ethanol / 1000g water) = 0.43 mole ethanol So, there is 0.43 mole of ethanol in 250g of water. But, how do we calculate the mass? To do this, we need to set up another stoichiometry ratio using the molar mass of ethanol. To calculate the molar mass of ethanol, we sum the molecular weight of each of the atoms in it. Ethanol has the molecular formula C2H5OH, so there are two carbon atoms, six hydrogen atoms, and one oxygen atom. We can calculate the molar mass of ethanol as follows: Carbon: 2 * 12.01g/mol Hydrogen: 6 * 1.007g/mol Oxygen: 15.999g/mol So, the total molar mass for ethanol is 46.07g/mol Now, we can convert the moles we calculated for ethanol in 250g of water to grams. 0.43 moles ethanol (46.07g / 1 mol) = 20.15g ethanol

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