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In Chemistry, we measure things in u(unified mass), but this is really really really small. It is not a practical way to talk about things. (I mean, do you know what 3 u's looks like, cuz i don't) A man named Avogadro came up with a better system. He discovered how many atoms it takes to convert u's to grams. This way you can work with larger amounts than only a few atoms. It turns out that exactly 6.022 x 10 ^23 atoms will convert u's to grams.
So, let's first understand u's. These values are unique for each atom, molecule, compound etc.... For atoms, the magnitude (value) can be found on the Periodic Table. For example Cl is 35.45 u.
In context(questions):
1. How many ATOMS are in one mole of Chlorine? This is tricky only because there is extra information. A mole of any substance has the same number of atoms (6.022 x 10 ^23), because it is the conversion. The number of atoms in a mole doesn't ever change.
2. How many GRAMS ar in 2 moles of Chlorine? 70.90 grams. One mole contains 35.45, so two moles is twice that number, 70.90.
3. How many moles are in 90.0 grams of Cl? approx. 2.54 moles. This is backwards from the last question. Take the 90.0 grams and divide it by the number of grams in one mole (35.45).
My suggestion to you is that you should use conversion factors. If you can successfully do this you won't even have to understand why you are doing what you are doing. (Note: make sure you understand conversion factors first. The units must cancel. Any con. factor can be flipped)
Some useful conversion factors:
1 mole/ 6.022 x 10 ^23 atoms
#(off of Periodic Table)/ 1 mole
#in U's = # in grams so #in u /# grams
ECT..
Good Luck. This is a tough topic for a lot of Chemistry students.
What else can I help you with?
How can one determine the mole-to-mole ratio in a chemical reaction?
To determine the mole-to-mole ratio in a chemical reaction, you can use the coefficients of the balanced chemical equation. The coefficients represent the number of moles of each substance involved in the reaction. By comparing the coefficients of the reactants and products, you can determine the mole-to-mole ratio between them.
How do you determine the mole ratio in a chemical reaction?
To determine the mole ratio in a chemical reaction, you look at the coefficients of the balanced chemical equation. The coefficients represent the number of moles of each substance involved in the reaction. The ratio of these coefficients gives you the mole ratio.
How can one determine the mole ratio in a chemical reaction?
To determine the mole ratio in a chemical reaction, you can use the coefficients of the balanced chemical equation. The coefficients represent the number of moles of each substance involved in the reaction. By comparing the coefficients of the reactants and products, you can determine the mole ratio between them.
What is the balance chemical equation for the reaction of one mole of carbonic acid with one mole of potassium hydroxide?
2 KOH + H2CO3 = 2 H2O + K2CO3
What does the term "mole" mean in a chemical formula?
In a chemical formula, the term "mole" represents a unit of measurement that indicates the amount of a substance present. It is used to quantify the number of atoms, molecules, or ions in a sample of a substance.
What Different definitions can be give to the chemical term mole?
mole- a chemical term.
How can one determine the mole-to-mole ratio in a chemical reaction?
To determine the mole-to-mole ratio in a chemical reaction, you can use the coefficients of the balanced chemical equation. The coefficients represent the number of moles of each substance involved in the reaction. By comparing the coefficients of the reactants and products, you can determine the mole-to-mole ratio between them.
What is one mole of a chemical?
A mole of a chemical is 6.02x10^23 particles of that particular substance. So if you had a mole of Hydrochloric acid, you would have 6.02x10^23 molecules of HCl.
What evidence in chemical reaction in mole?
Mole is the the unit for amount of substance in SI.
How do you determine the mole ratio in a chemical reaction?
To determine the mole ratio in a chemical reaction, you look at the coefficients of the balanced chemical equation. The coefficients represent the number of moles of each substance involved in the reaction. The ratio of these coefficients gives you the mole ratio.
Where do you use chemical mole?
its a unit in chemistry
What is the relationship between chemical equation and mole?
There is no relation.
How can one determine the mole ratio in a chemical reaction?
To determine the mole ratio in a chemical reaction, you can use the coefficients of the balanced chemical equation. The coefficients represent the number of moles of each substance involved in the reaction. By comparing the coefficients of the reactants and products, you can determine the mole ratio between them.
What is a name for a mole?
Another name for a mole is the gram-molecule. It is a measurement used to express amounts of a chemical substance.
Which is description of a mole?
The mole is a unit of measurement for the amount of substance or chemical amount. It is one of the base units in the International System of Units, and has the unit symbol mole.
Why are coefficients used in chemical equations?
to determine the mole of the atom
How many grames in a mole?
This depends on the chemical formula of the compound.
