All categories

2 years ago

Please help make sure its correct thanks

Chemistry

1 answer:

Wewaii [24]2 years ago

5 0

The empirical formula of metal iodide : CoI₃(Cobalt(III) Iodide)

<h3>Further explanation</h3>

13.02 g sample of Cobalt , then mol Co(MW=58.933 g/mol) :

$\tt mol=\dfrac{mass}{Ar}=\\\\mol=\dfrac{13.02~g}{58.933}\\\\mol=0.221$

Mass of metal iodide formed : 97.12 g, so mass of Iodine :

$\tt =mass~metal~iodide-mass~Cobalt\\\\=97.12-13.02\\\\=84.1~g$

Then mol iodine (MW=126.9045 g/mol) :

$\tt \dfrac{84.1}{126.9045}=0.663$

mol ratio of Cobalt and Iodine in the compound :

$\tt 0.221\div 0.663=1\div 3$

You might be interested in

Determine the percent yield of a reaction that produces 28.65 g of Fe when 50.00 g of Fe2O3 react with excess Al according to th

Luba_88 [7]

Answer:

The percent yield of the reaction is 82%

Explanation:

First step: make the chemist equation.

2 Al (s) + Fe2O3 (s) → 2 Fe (s) + Al2O3 (s)

As the statement says that aluminun is in excess, the limiting reactant is the Fe2O3

Second step: Find out the moles in the reactant.

Molar weight Fe2O3: 159.7 g/m

Mass / Molar weight = moles

50 g /159.7 g/m = 0.313 moles

Third step: Analyse the reaction. 1 mol of Fe2O3 makes 2 moles of Fe.

1 mol Fe2O3 ____ 2Fe

0.313 mol Fe2O3 ____ 0.626 moles

Molar weight Fe = 55.85 g/m

Moles . molar weight = mass

55.85g/m . 0.626m = 34.9 grams

This will be the 100% yield of the reaction but we only made 28.65 g

34.9 g ____ 100%

28.65 g ____ 82.09 %

3 0

3 years ago

Read 2 more answers

Electrons surround the , of an atom in various energy levels called

nasty-shy [4]

surrounds the nucleus of an atom in various energy levels called orbitals.

Explanation:

Electrons surrounds the nucleus of an atom in various energy levels called orbitals.

According to the Bohr's model of an atom, the extra nuclear space is made up of electrons in specific spherical orbits called shells or energy levels.

The region of a maximum probability of where an electron is located is sometimes referred to as an electron cloud or orbital.
Electrons move round the nucleus in certain permissible orbits.
An electron in an energy level posses a definite amount of energy associated with it at that level.
Electrons moves through the energy levels by gaining or losing energy.

Learn more:

Bohr brainly.com/question/4986277

#learnwithBrainly

7 0

3 years ago

1.  CH4 + 2O2 → 2CO2 + 2H2O = Balanced or Unbalanced

Sergio [31]

1)unbalanced

2)Unbalanced

3)unbalanced

4)Unbalanced

5)Unbalanced

6)Unbalanced

7)Unbalanced

this might be wrong but i didnt see the same amount of certain elements on both sides

6 0

3 years ago

Selenium has six valence electrons. What is the valence of selenium?

viktelen [127]

The six electrons in the outermost shell allow selenium to have a variety of valence numbers.

The 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

May have 4;

example

selenium tetrafluoride SeF4, selenium dioxide SeO2

MAy have 2;

example

selenium difluoride SeF2, selenium dichloride SeCl2

and may have -2;

example

hydrogen selenide H2Se

3 0

3 years ago

method to measure soluble organic carbon in seawater includes oxidation of the organic materials to CO2 with K2S2O8, followed by

dusya [7]

Answer:

The ppm carbon in the seawater is 104.01.

Explanation:

Mass of seawater = 6.234 g

Mass of carbon dioxide gas produced = 2.378 mg = 0.002378 g

1 mg = 0.001 g

Moles of carbon dioxide gas = $\frac{0.002378 g}{44.009 g/mol}=5.4034\times 10^{-5} mol$