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1 answer:
Answer:
The density of copper is 8.9 grams per cubic centimeter.
Explanation:
There is a writing mistake in statement, correct form is written below:
<em>A 124.6 grams sample of copper has a volume of 14 cubic centimeters. What is the density of copper?</em>
Let suppose that mass of the copper sample is distributed uniformly in its volume, then we shall use the following definition of density (), in grams per cubic centimeter:
(1)
Where:
- Mass, in grams.
- Volume, in cubic centimeters.
If we know that and
, then the density of the sample of copper is:
The density of copper is 8.9 grams per cubic centimeter.
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Answer:
Lewis structure of polyatomic formate anion.
Explanation:
To draw Lewis structure for any chemical species,
1)Count the total number of valence electrons present in it.
This can be obtained by adding valence electrons of each constituent atom.
2)Arrange those valence electrons in such a way that each atom should attain eight electrons around it to satisfy octet theory.
The structure of formate ion and its Lewis structure are shown below:
HCOO- is the formate ion.
It has total:
1+4+6+6+1 = 18 valence electrons.
Since, hydrogen has one, carbon has four and oxygen has six valence electrons and the charge of the anion is one.
Arrange this 18 electrons in such a way that each atom should get 8 electrons around it.
Resonance structures of formate ion:
