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# Tutor profile: Divya N.

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Divya N.
Chemistry Graduate at Eastern Illinois University
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## Questions

### Subject:Chemistry

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Question:

In an reduction reaction, about 0.380 grams of sodium borohydride was used. What is the amount in mmol used of this compound?

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Divya N.

Step 1: Figure out the formula of sodium borohydride, which is NaBH4 Step 2: Figure the molecular weight (g/mol) of NaBH4: Mass of Na is 22.989 g/mol , B is 10.811 g/mol , and H is 1.008 g/mol (1 x 22.989)+(1 x 10.811)+(4 x 1.008)= 37.832 g/mol of NaBH4 Step 3: Use stoichiometry to convert g to mmol of NaBH4 (0.380 g of NaBH4) x (1 mol of NaBH4/ 37.832 g of NaBH4) x (1000 mmol/1 mol)= 10.04440685 mmol of NaBH4 Step 4: The answer should be rounded off according to the rules of significant figure. The maximum amount of significant figure would be three since 0.380 g has a significant figure of three. Answer: 10.0 mmol of NaBH4 was used.

### Subject:Basic Chemistry

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Question:

What is the center of an atom called? Also, what does the center of an atom contain?

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Divya N.

The center of an atom is called the nucleus and it contains protons and neutrons.

### Subject:Algebra

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Question:

Solve for x in ((1/4)x)-(1/2(x))=1

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Divya N.

Step 1.) The denominator of the fraction needs to be the same. Thus, the fraction -((1/2)(x)) is multiplied by two ((1/4)x)-(2/4(x))=1 Step 2.) Combine the two fractions ((1x-2x)/4)=1 (-x/4)=1 Step 3.) Multiply four on both sides in order to get rid of the denominator. Then you get this: -x=4 Step 4.) In order to solve for x divide -1 on both sides x=-4

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