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4 years ago

Selenium has six valence electrons. what is the valence of selenium

1 answer:

8 0

He valence of selenium depends on which compound it is in. Selenium is very similar to sulfur. It may have a valence of 6; example selenium hexafluoride SeF6, selenium trioxide SeO3
4; example selenium tetrafluoride SeF4, selenium dioxide SeO2 
2; example selenium difluoride SeF2, selenium dichloride SeCl2 
and -2; example hydrogen selenide H2Se

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The percent yield of this reaction is consistently 92.0%. CH4(g) + 4 S(g) → CS2(g) + 2 H2S(g) How many grams of sulfur would be

dybincka [34]

Answer:

132.17 g

Explanation:

The reaction given , in the question is -

CH₄ (g ) + 4 S ( g ) ---> CS₂ ( g ) + 2H₂S ( g )

From the reaction , 4 mole of S is required for the production of 1 mole of CS₂ .

since ,

Moles of CS₂ = given mass of CS₂ / Molecular weight of CS₂

Since ,

the Molecular weight of CS₂ = 76

Given , mass of CS₂ = 72.57 g

Moles of CS₂ = 72.57 / 76 = 0.95 mol

Since ,

The yield is 92.0 % .

Moles of S required = 4 * 0.95 mol / 0.92 = 4.13 moles

Mass of S required = 4.13 * 32 = 132.17 g .

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3 years ago

2. In photosynthesis, organisms use carbon dioxide and the energy of sunlight to

Scorpion4ik [409]

Answer:

during the process of photosyntesis,organisms use carbon dioxide and sunlight to producs glucose(food).

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3 years ago

Read 2 more answers

How do Cilia and flagella help cells?

otez555 [7]

Answer:

They are protection from the cell!

Explanation:

They move liquid around the cells and have the same internal structure as each other. They are also found in most microorganisms. Hope this helps :)

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3 years ago

Which mixture can be separated based on differences in particle size of the components?

Aleksandr [31]

Heterogenous mixtures can separates due to differences in size of components

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3 years ago

With thermodynamics, one cannot determine ________. With thermodynamics, one cannot determine ________. the temperature at which

Paraphin [41]

Answer:

With thermodynamics, one cannot determine the speed of a reaction.

Explanation:

Chemical thermodynamics, a branch of chemistry that deals with study of interrelation of the heat and the work with the chemical reactions or with the physical changes of the state within confines of laws of thermodynamics.

Chemical thermodynamics' structure is derived from first two laws of chemical thermodynamics. From fundamental equations of Gibbs, a multitude of some equations which relates thermodynamic properties of thermodynamic system can be derived and can be used to calculate the reaction spontaneity, equilibrium constant, etc.

Thermodynamics predicts about the direction, feasibility and the extent of a chemical process, it does not tell anything about the rate at which a chemical process may proceed.

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4 years ago