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4vir4ik [10]
3 years ago
8

Why is helium considered as a noble gas

Chemistry
2 answers:
dolphi86 [110]3 years ago
7 0
Noble gases are known for having a full outer shell of electrons which helium has as it has two electrons its first electron shell is completely filled

larisa [96]3 years ago
3 0
Helium is  considered a noble gas because it has 8 valence electrons, as well as it also is a stable element. Meaning that it consists of a full octet. 
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Brilliant_brown [7]

Answer:

Thus, first conversion of mass of methane into moles by dividing it with 16.04 g/mol

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Explanation:

The balanced chemical reaction is shown below:-

CH_4+2O_2\rightarrow CO_2+2H_2O

Firstly the moles of methane gas reacted must be calculate as:-

Given, mass of methane = 50.6 g

Molar mass of methane gas = 16.04 g/mol

The formula for the calculation of moles is:-

Moles=\frac{Mass\ taken}{Molar\ mass}=\frac{50.6}{16.04}\ mol=3.15\ mol

Thus, from the reaction stoichiometry,

1 mole of methane produces 1 mole of carbon dioxide

Also,

3.15 mole of methane produces 3.15 mole of carbon dioxide

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Molar mass of CO_2 = 44.01 g/mol

Mass = Moles*Molar mass = 3.15\times 44.01 g = 138.63 g

3 0
3 years ago
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kipiarov [429]

Answer:

-0

Explanation:

8 0
3 years ago
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Neporo4naja [7]

Answer:

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6 0
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Explanation:

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3 years ago
americium-241 has a half-life of 430 years. how much of a 10.0g sample of americium-241 remains after 1720 years?
Arlecino [84]

Answer:

(a) What are the half-lives of these two isotopes? (b) Which one decays at a faster rate? (c) How much of a 1.00-mg sample of each isotope remains after 3 half- ...

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