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Starting with barium carbonate describe how you can prepare a dry sample of barium sulphate |
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Answer» Answer: Well, you need to KNOW the atomic weight of Platinum (Pt) and the number of atoms PER mole. The answer to the former is 195.084 g/mole and the latter is 6.023 * 10^23 atoms/mole. Then, multiply everything as shown below: Number of atoms = (1 g) * (1/195.084 g/mole) * 6.023 * 10^23 atoms/mole Number of atoms = 3.087 * 10^21 atoms Note, I’ve INCLUDED UNITS on everything and you can see that they all cancel except for atoms. Dragging the units along can be a pain but it is a great way to check that they way the numbers are being combined is CORRECT. |
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