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denis-greek [22]
3 years ago
8

Convert for the following kelvin temperatures to degrees Celsius 188K 631K

Chemistry
1 answer:
densk [106]3 years ago
7 0

Answer:

187,726.85 and 630,726.85

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A. Clearly draw the Lewis structure for the PBr4- ion. Show your math where
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Answer:

   Br

    |

Br-P-Br

    |

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Explanation:

To calculate the valance electrons, look at the periodic table to find the valance electrons for each atom and add them together. P is in column 5A, so it has 5, Br is in column 7A, so it has 7 (multiply by 4 since there are 4 Br atoms to give 28) and there is a 1- charge, so add one more electron. 5+28+1=34, so there are 34 electrons to place. P would be the central atom, so place it in the middle. Place each Br around the P (as shown above) with a a single line connecting it. Each line represents 2 electrons, so 8 total have been place, leaving 26 remaining. Place 6 electrons around each Br (2 on each of the unbonded sides), which leaves 2 electrons remaining. The remaining pair of unbound electrons will be attached to the P between any two Br atoms. Phosphorus doesn't have to follow the octet rule, so it actually ends up with 10 valance electrons.

4 0
3 years ago
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Boron (B) has two isotopes, boron-10 and boron-11. The atomic weight of boron is ?
suter [353]

Answer:

Approximately 10,5

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The question is not really very specific, because it would need the percentages of those isotopes in the nature. As they are not shown, it should be the median of those two numbers.

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If you check a periodic table, you'll see it's actually 10,8, but that's because of the thing I told you at first (percentages missing).

Hope I could help.

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