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Tutor profile: Miranda J.

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Miranda J.
Research Intern for Mayo Clinic
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Questions

Subject:Organic Chemistry

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Question:

How many grams of Na2CO3 are in 5.61mol of Na2CO3?

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Miranda J.

Calculate the molecular mass of Na2CO3 using the molecular weight of each element provided by the periodic table. Molecular weight =(2⋅22.990)+(12)+(3⋅16)=105.99g of Na2CO3 Next, convert grams to moles. 5.61molNa2CO3 x (105.99gramsNa2CO3/1molNa2CO3) =595g of Na2CO3 Remember to use the correct number of significant figures!

Subject:Basic Chemistry

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Question:

What volume of a 1.2M solution of hydrochloric acid is needed to neutralize 50mL of a 3M sodium hydroxide solution?

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Miranda J.

125mL; The molarity of an acid and the volume of an acid multiplied equals the molarity of the base and volume of the base multiplied. (The volume needs to be converted to liters!) (Ma)(Va)=(Mb)(Ma) (1.2M)Va=(3M)(0.050L) Va=(3M)(0.050L)/(1.2M) = 0.125L = 125mL

Subject:Biology

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Question:

Red blood cell development takes place in what structure of the bones?

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Miranda J.

Red bone marrow; The red bone marrow is found at the ends of long bones. At this point, red blood cell development occurs--which is called-- hematopoiesis. In contrast, yellow bone marrow is primarily composed of fat.

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