Transcription – Mole Concept Part 2: A Complete Study Guide

In this video, Chemistry Tutor goes more in depth about the topic of Mole Concept.

This is part 2 out of 2 of the Mole Concept topic.

First formula is: Number of moles=Mass / Mr (Mr refers to the molecular mass of an element or compound)

Second formula is: Number of moles of gas = Volume/ 24 dm3 or Number of moles of gas = Volume / 24 000 cm3

This formula can only be used when gaseous elements are involved.

Third (and last) formula: Number of Moles = Concentration x Volume Concentration ONLY applies to aqueous solutions.

Transcription – Mole Concept Part 2 refers to the second part of a lesson covering two chemistry and biology topics:

Transcription – In biology, transcription is the process by which genetic information stored in DNA is copied into messenger RNA (mRNA). This is the first step in making proteins inside cells.

Transcription Mole Concept 2

During transcription:

DNA unwinds.
An enzyme called RNA polymerase reads one DNA strand.
A complementary mRNA strand is produced.
The mRNA then leaves the nucleus (in eukaryotic cells) to be used in protein synthesis.

Mole Concept (Part 2) – In chemistry, the second part of the mole concept usually builds on the basics by teaching how to perform calculations involving moles, such as:

Converting between moles and mass using the formula:

$Mass\text{Moles} = \frac{\text{Mass}}{\text{Molar Mass}}$
Converting between moles and number of particles using Avogadro’s constant:

$particles=Moles×6.022×1023\text{Number of particles} = \text{Moles} \times 6.022 \times 10^{23}$
Calculating molar mass.
Using moles in chemical equations (stoichiometry) to determine the amounts of reactants and products.

In short, “Transcription – Mole Concept Part 2” is likely the title of a lesson that covers:

Transcription (a biology topic about DNA being copied into mRNA), and
Mole Concept Part 2 (a chemistry topic focused on mole calculations and their applications in chemical reactions).

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