2423704
Description
Flashcards by Ashia Rigby, updated more than 1 year ago
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Created by Ashia Rigby
over 10 years ago
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| Question | Answer |
| What does Avogadro's number represent? (6.02 X 10 ^23) | It represents the number of carbon atoms in 12g of carbon. One mole of any type of particle contains this number in particles whether they're atoms, ions or molecules. |
| The mass of one mole (1 mol of atoms of an element) is equal to what? | It's equal to its relative atomic mass in grams. EG/ 1 mol of hydrogen atoms has a mass of 1g and 1 mol of carbon atoms has a mass of 12g. |
| What is the equation that shows how to work out the number of moles of an element? | number of moles= mass(g) / relative atomic mass |
| The relative formula mass of a substance is the sum of all the atoms in its formula. Use Methane CH4 as your example. | CH4= 16 (12 + 1 + 1 + 1 + 1) |
| the mass of one mole of a compound is equal to its relative atomic mass in grams. So, what would be the mass of Methane (CH4) - use your answer from the previous card to help you. | 16 grams. This is the equation shows how to work out the number of moles of a compound: Number of Moles= Mass (g) / Relative formula mass. |
| The next section of these cards is on moles in solution. | ENJOY |
| What can the concentration of a solute in a solution be measured in? | g dm ^-3 OR mol dm ^-3 |
| Moles to mass calculations? | mass (g) = relative atomic mass X number of moles. mass (g) = relative formula mass X number of moles. |
| What is the mass of 0.1 mol of oxygen molecules, 02? (relative atomic mass of oxygen is 16) | Relative formula mass of 02 = 16+16=32 mass of 0.1 mol = 32 X 0.1= 3.2g |
| Solution calculation? | Concentration (moldm-3)= moles of solute (mol) / volume of solution (dm^3) |
| What does Mol dm^-3 stand for? | Moles per cubic decimetre. |
| Conversions - how do you convert between g dm^-3 and moldm^-3 ? | divide the concentration by the relative formula mass. |
| Conversions - how do you convert between moldm^-3 and g dm^-3? | multiply the concentration by the relative formula mass. |
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