Nina Z.

Chemistry

03/10/21

chemistry question

If a sample of gas has a temperature of 43.2oC, what is the temperature in Kelvin?

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Chemistry

03/09/21

What is the concentration of OH- in a 0.359M solution of Mg(OH)2?

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Chemistry

03/05/21

Solution Chemistry Stoichiometry

In a titration, 350.6 mL of a 1.52 M solution of hydrochloric acid is neutralized by with 0.376 L of magnesium hydroxide. What is the molarity of the base?

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Chemistry

02/25/21

College Chemistry 1

Leucine is an amino acid with the formula . C6H13NO2 Determine the number of moles of carbon in 94.34g of leucine.

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Chemistry

02/25/21

College Chemistry 1

A sample of trifluoroacetic acid, C2HF3O2, contains 80.5 g of fluorine. Calculate the mass of the trifluoroacetic acid sample.

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Chemistry

02/25/21

Chemistry HomeWork

For a theoretical yield of 2.11 g and percent yield of 94.8362%, calculate the actual yield for a chemical reaction. Answer in units of g

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Chemistry

10/28/20

Which would emit the lowest frequency?

Which energy transition would emit a photon with the lowest frequency of light in a hydrogen-like atom? n=2 to n=3n=3 to n=9n=8 to n=5n=4 to n=2

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Organic Chemistry

10/28/20

Messages to Tutors Not Showing Up in Inbox

I'm messaging various tutors, but they aren't showing up in my inbox. Are the messages going through? Please help!!

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Chemistry

09/23/20

. Complete the following table.

isotope, atomic number, mass number, number of protons, number of neutrons 236/92 U 94/43 Tc

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Chemistry

09/23/20

Calculate the half-life of the radioisotope

4. A 160. mg sample of radium-224 weighs 20.0 mg after 9.0 years. Calculate the half-life of the radioisotope.

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Biology Chemistry Biochemistry

01/29/20

Biology Question

How many grams of NaCl would you dissolve in water to make a 500 mM NaCl solution with 1-liter final volume ?

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Biology Chemistry Biochemistry

01/29/20

Biology Question

How much milliliters of absolute ethanol (100% ethanol) would you mix with how much milliliter of pure water to make 100ml of 70% (v/v) ethanol solution ?

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Answers •2

Chemistry

01/24/20