the formula of aluminium sulphide is Al₂S₃. Explain why the formula has a ratio of two aluminium ions for every three sulphide ions.

Answers

Answer 1

Answer: Molar mass of Al = 27.0 g/mol
Molar mass of S = 32.1 g/mol
Molar mass of Aluminium sulfide = 27.0 x 2 + 32.1 x 3 = 150.3 g/mol
% of Al (there are 2 Al atoms) in Aluminium sulfide = $(54.0)/(150.3) * 100 = 35.9%$
% of S (there are 3 S atoms) in Aluminium sulfide = $(96.3)/(150.3) * 100 = 64.1%$
Assume the percentages to be masses, so:
In 100.0 g of Aluminium sulfide, n (Al) = $(35.9)/(27.0) = 1.33 mol$
In 100.0 g of Aluminium sulfide, n (S) = $(64.1)/(32.1) = 2.00 mol$
Convert values to a molar ratio,
1.33 : 2.00
Divide by smallest ratio value,
1 : 1.50
Multiply each ratio value by a factor of 2 to eliminate the decimal,
2 : 3

Hence why the empirical formula of Aluminium sulfide is $Al_(2) S_(3)$

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What is the oxidation number of Mn in KMnO₄? a. -7
b. -3
c. 0
d. +3
e. +7

Answers

I think the answer is e? That's if o is -2 if not it will be a

A common stain remover is sold in concentrated form as 3M sodium hypochlorite (NaOCl). You need to create 400 milliliters of a 0.5M solution of sodium hypochlorite to fill a spray bottle. What volume of 3M sodium hypochlorite is needed?15.0 mL

66.7 mL

133 mL

167 mL

Answers

To solve this we use the equation,

M1V1 = M2V2

where M1 is the concentration of the stocksolution, V1 is the volume of the stock solution, M2 is the concentration ofthe new solution and V2 is its volume.

3 M x V1 = 0.50 M x .400 L

V1 = 0.07 L or 66.67 mL of the 3M sodium hypochlorite solution

The correct answer is the second option given.

Answer:

V2 = 66.67mL

Explanation:

Hello! To calculate this we have to take into account the equation that relates two substances:

M1 * V1 = M2 * V2

We have the concentration and volume of a substance and the concentration of the second. We have to find out the volume.

M1 = 0.5M

V1 = 400mL

M2 = 3M

V2 = (M1 * V1) / M2

V2 = (0.5M * 400mL) / 3M

V2 = 66.67mL

Which statement describes heterogeneous mixtures?A. They are made up of two or more pure substances that are not chemically bonded together.
B. They appear uniform, like a pure substance.
C. They have fixed ratios between their components.
D. They are made up of two or more pure substances that can be separated only by chemical processes.

Answers

The righ answer is the option A. They are made up of two or more pure substances that are not chemically bonded. A classicall expample ot heterogeneous mixtures are sugar and salt. Sugar is a pure substance, salt is also a pure substance, when you mixe them you form mixture where salt is still salt and sugar is still sugar, that is what "they are not chemically bonded" means. So you can separate them by physical media.

The right answer is the option A. They are made up of two or more pure substances that are not chemically bonded. A classicall expample ot heterogeneous mixtures are sugar and salt. Sugar is a pure substance, salt is also a pure substance, when you mixe them you form mixture where salt is still salt and sugar is still sugar, that is what "they are not chemically bonded" means. So you can separate them by physical media.

Identify the number of neutrons in one atom of sulfur with an isotopic mass number of 34 Amu

Answers

Mass number = number of neutrons + number of protons

In a periodic table, or other tables, you find that the atomic number of sulfur is 16. That means it has 16 protons.

Then the number of neutrons = 34 - 16 = 18.

3Pb(s) + 2H3PO4(l) →

Answers

Answer:

3Pb(s) + 2H3PO4(l) →H3PO4 + Pb3(PO4)2 H2

Explanation:

I hope I helped you :P

Which element has an atom in the ground state with a total of three valence electrons

Answers

1) Aluminum
2) Lithium
3) Phosphorus

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