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valentina_108 [34]
3 years ago
9

Compare the mass number and atomic number for isotopes of an element

Chemistry
1 answer:
Zanzabum3 years ago
3 0
An isotope is when there is same amount of atomic number but different mass number. It also mean that only the number of neutrons changes if there is an isotope present.
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In the gaseous state, chlorine exists as a diatomic molecule Cl2 (Molar mass = 70.9 g/mol). Calculate the number of moles of chl
Annette [7]

Answer:

3.67 mol Cl

Explanation:

We need to convert g of Cl 2 to moles of Cl. First we divide 130 gCl2  by the molar mass (70.90 gCl2/mol) to find out how many moles of Cl2 do we have.

130 gCl2 x \frac{1 mol Cl2 }{70.90 gCl2} = 1.83 mol Cl2

Then we need to convert 1.83 mol de Cl2 to moles of Cl. We have 2 moles of Cl in every Cl2 molecule so we just need to multiply by 2.

1.83 molCl2 x \frac{2 molCl}{1 molCl2} = 3.67 molCl

8 0
3 years ago
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. Element X has a nucleon (mass) number of 19 and a proton (atomic) number of 9.
Marina86 [1]

Answer:

C

Explanation:

it belong to that group as it needs 1 electron to be chemically stable

7 0
2 years ago
How are gems different from regular minerals? Gems are softer than regular minerals. Regular minerals are more beautiful than ge
just olya [345]
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2 years ago
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If a shell can hold a maximum of 32 electrons, what is the value of n?
olga2289 [7]
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4 0
3 years ago
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A student was given a solid containing a mixture of nitrate salts. The sample completely dissolved in water, and upon addition o
finlep [7]

Answer:

Explanation:

   The nitrates of Bi,Sn and Cd is ruled out because their sulfides are insoluble in acidic medium.

Nitrates of Ni or Co may be present because their sulfides are insoluble in basic medium. The presence of other nitrates are ruled out.

5 0
2 years ago
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