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9 Cards in this Set
- Front
- Back
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What is a Mole(mol) |
A measure of the number of particles (atoms, ions, or molecules) contained in a substance |
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How many particles are contained in one mole of any substance? |
six hundred billion billion 6.02 x 10 ^23 |
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What is the Avogadro Constant? |
The amount of particles in one mole of a substance, which equals to 6.02 x 10 ^23 |
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What is the relationship between the mass of one mole of a substance and the substance's relative atomic mass? |
The mass of one mole of a substance is its relative atomic mass or relative formula mass in grams. |
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Give an example of this relation with Sodium |
One mole of Sodium contains 6.02 x 10^23 atoms. The relative formula mass / relative atomic mass of Sodium (Na) is 23. One mole of sodium atoms has a mass of 23g. 6.02 x 10^23 sodium atoms weigh 23g. |
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How do we calculate the amount of substance (no moles) in a given mass of a substance? |
amount (moles) = mass of substance (g) / atomic mass |
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Calculate the number of moles of Carbon Dioxide in 33g of the compound |
amount = mass of substance / formula mass = 33 / 44
= 0.75 mol |
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What are two ways of writing Relative Atomic Mass? |
Ar or RAM |
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How do we calculate the Ar of a compound? |
Add together the relative atomic mass of each atom. E.g Carbon Dioxide Carbon has an Ar of 12 Oxygen has an Ar of 16 There is one carbon atom and two oxygen atoms Ar = (12 x 1) + (16x2) = 44. |
