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Calculations in Chemistry
Calculations in Chemistry
Objectives
Objectives
(CLO1). Explain basic chemical concepts related to chemical changes, energy, and properties of matter.
(CLO4). Interpret and utilize mathematical formulas while solving problems
(MLO1-13) Convert between mass, moles and number of atoms using the relationships between Avogadro’s number, moles, molar mass and grams.
(MLO3-4) Calculate molar mass and convert between mass and moles
(MLO3-5) Calculate the percent composition of a compound or determine the empirical and molecular formula of a compound from percent composition or from combustion analysis data.
This assignment is available as a Google doc at https://docs.google.com/document/d/1bxRyVoT_WMzzyb6XUVUvCsiJxOtT999hsJhLAcLtXAQ
Activity 9.mp4Mass to Mole and Molar Mass
Activity 9
Moles and Percent.mp4% Composition and Elemental Analysis of organic compounds
Stoichiometry and Limiting - Activity 12.mp4This presentation covers calculations of
mole to mole ratios
gram to mole conversions
mole to gram conversions
gram to gram stiochiometry calculation
elemental analysis
Mole Conversions Made Easy: How to Convert Between Grams and Moles
Mole Conversions Made Easy: How to Convert Between Grams and Moles
This is a whiteboard animation tutorial of how to solve mole conversion calculations. In chemistry, a mole is a very large number of things. Typically, the things are atoms, molecules, or other compounds. A mole of atoms or molecules is an amount that you can see. For example, one mole of water molecules is about 18 mL or a little more than a tablespoon.
Moles, grams and molar mass for atoms and molecules (Tyler DeWitt)
Mass, Moles and Avogadro's Number
Mass, Moles and Avogadro's Number
Counting Atoms: Intro to Moles Part 2 - https://youtu.be/hY7lzRBylSk
Converting Between Moles, Atoms, and Molecules - https://youtu.be/HMAOrGpkTsQ
Converting between Moles, Atoms, and Molecules (Part 2) - https://youtu.be/kGNtnq0kGKk
Converting Between Moles and Liters of a Gas at STP - https://youtu.be/Y8e7T09SKZ0
How to Calculate Molar Mass Practice Problems - https://youtu.be/Qflq48Foh2w
The Most Common Mistake with Moles! - https://youtu.be/wHwGm9oL-GA
Calculate the Mass of a Single Atom or Molecule - https://youtu.be/vqTg4cYwHXY
Converting Between Grams and Moles - https://youtu.be/CMnkSb2YsXI
Converting Between Grams and Moles (Part 2) - https://youtu.be/0RXB8xNmJNM
What's the difference between a Mole and a Molecule? - https://youtu.be/2P--fRgdSF0
https://www.edumedia-sciences.com/en/media/196-molar-mass
This simulation allows you to calculate the molar mass of a compound or element.
Percent Composition By Mass
Percent Composition By Mass
We'll learn how to calculate percent composition by mass, and we'll work through a number of practice problems. To calculate percent by mass, you need to determine two things: the mass of just the element, and the molar mass of the whole compound. Then, you take the molar mass of just the element and divide it by the molar mass of the whole compound, and multiply by 100%.
Empirical Formula and Molecular Formula Introduction
Empirical Formula and Molecular Formula Introduction
We will talk about what empirical formula and molecular formula are, how they are different, and we'll learn how to write the empirical formula for a compound when you are given the molecular formula. Molecular formulas tell you how many atoms of each element are in a compound, and empirical formulas tell you the simplest or most reduced ratio of elements in a compound. If a compound's molecular formula cannot be reduced any more, then the empirical formula is the same as the molecular formula. Also, many compounds with different molecular formula have the same empirical formula.
Writing Empirical Formula Practice Problems
Writing Empirical Formula Practice Problems
We'll practice writing empirical formulas for a whole bunch of molecular formulas. In order to write the empirical formula, you find the largest number you can divide all of the subscripts by, to reduce it as much as possible. You know that you have the empirical formula when your new compound formula cannot be reduced any more. For some formulas, the molecular formula is that same as the empirical formula. Also, it's possible for more than one compound to have the same empirical formula. In fact, that happens quite often.
Calculating Molecular Formula from Empirical Formula
Calculating Molecular Formula from Empirical Formula
We'll learn how to calculate molecular formula for a compound when you are given its empirical formula and its molar mass. In order to do this, you need to figure out what to multiply the empirical formula by to get the molecular formula and the correct molar mass. The multiple can be determined by dividing the molar mass of the compound by the molar mass of the empirical formula.
Empirical and Molecular Formula
Empirical and Molecular Formula
Empirical Formula and Molecular Formula Introduction - https://youtu.be/wnRaBWvhYKY
Writing Empirical Formula Practice Problems - https://youtu.be/ucU5PD6W3Ik
Calculating Molecular Formula from Empirical Formula - https://youtu.be/J_MtVs0aBdU
Percent Composition Common Mistakes - https://youtu.be/lh1endFwo80
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