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Leya [2.2K]
3 years ago
15

The ____________________ Era accounts for most of the history of Earth.

Chemistry
2 answers:
Slav-nsk [51]3 years ago
6 0
Pretty sure it's the Precambrian.

balandron [24]3 years ago
4 0
Yup! It's the Precambrian! :)
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Is Acetaminophen ionic, molecular or organic compound
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Answer:

Organic compound

Explanation:

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Which of the following chemical symbols represents the element silver?
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Bis(bipyridyl)cadmium(II) chloride write the chemical formula
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Calculate the mass of beryllium (Be) needed to completely react with 18.9 g nitrogen gas (N2) to produce Bez N2, which is the on
choli [55]

Answer:

C = 18.29 g  

Explanation:

Given data:

Mass of beryllium needed = ?

Mass of nitrogen = 18.9 g

Solution:

Chemical equation:

3Be + N₂    →    Be₃N₂

now we will calculate the number of moles of nitrogen:

Number of moles = mass/molar mass

Number of moles = 18.9 g/ 28 g/mol

Number of moles = 0.675 mol

Now we will compare the moles of nitrogen and Be from balance chemical equation.

                     N₂        :       Be        

                       1          :       3

                  0.675       :      3/1×0.675 = 2.03 mol

Number of moles of Be needed are 2.03 mol.

Mass of Beryllium:

Mass = number of moles × molar mass

Mass = 2.03 mol ×   9.01 g/mol

Mass = 18.29 g  

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A mutation occurs whenever one of the bases in DNA is changed. What letters represent those bases?
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