Tutor profile: Gemma M.

Gemma M.

CRLA Level 1 Certified Tutor

Questions

Subject: Chemistry

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Question:

If the volume of a container filled with argon gas is 31.0 L, the pressure is 1.0 atm, and the temperature is 75.0 degrees C, how many moles of argon are present in the container?

Gemma M.

Answer:

Use the equation PV = nRT, where the gas constant R = 0.0821 L atm mol^-1 K^-1. Convert the temperature from Celsius to Kelvin, 75 + 273.15 = 348.15 K. Then simply plug everything in, giving (1 atm)(31 L) = n(0.0821 L atm mol^-1 K^-1)(348.15K). Solve for n using algebra, giving 1.1 moles of argon.

Subject: Biochemistry

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Question:

Which Watson-Crick base pair is more stable, C-G or A-T?

Gemma M.

Answer:

C-G is the more stable base pair because cytosine and guanine have three hydrogen bonds between them, while the adenine and thymine base pair only have two hydrogen bonds between them.

Subject: Biology

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Question:

What is the heritable unit transferred from parent to offspring called?

Gemma M.

Answer:

The heritable unit transferred from parent to offspring during reproduction is called a gene.

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