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antiseptic1488 [7]
3 years ago
6

Calculate the mass in grams of 202 atoms of iron

Chemistry
1 answer:
Sergeeva-Olga [200]3 years ago
4 0

Answer:

To calculate the number of atoms in a sample, divide its weight in grams by the amu atomic mass from the periodic table, then multiply the result by Avogadro's number: 6.02 x 10^23. Set up Equation Express the relationship of the three pieces of information you need to calculate the number of atoms in the sample in the form of an equation.

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Which of the following pairs of elements could possibly be in the same group? X has a 1+ ion; Y has a 1- ion. X tends to form a
exis [7]
Let's eliminate these one by one.
The first pair would not be the same, as X would most likely be in group IA, and Y would be in group VIIA, because of their tendency to gain and lose electrons.
The second pair would also violate the same rule, but X would most likely be in group IIA, and Y would most likely be in group VIA.
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5 0
3 years ago
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Triss [41]
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Approximately what percentage of a human's DNA is used for coding Information for the synthesis of proteins?
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