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2 years ago

Aluminium extraction from its ore

1 answer:

8 0

Aluminium ore is called bauxite. The bauxite is purified to produce aluminium oxide, a white powder from which aluminium can be extracted.

The extraction is done by electrolysis. The ions in the aluminium oxide must be free to move so that electricity can pass through it. Aluminium oxide has a very high melting point (over 2000°C) so it would be expensive to melt it. Aluminium oxide does not dissolve in water, but it does dissolve in molten cryolite. This is an aluminium compound with a lower melting point than aluminium oxide. The use of cryolite reduces some of the energy costs involved in extracting aluminium.

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Traumatic acid contains 63.13% carbon, 8.830% hydrogen, and 28.03% oxygen. its molar mass is 228 g/mol. determine the empirical

Zina [86]

Q1)
firstly we need to determine the empirical formula of the compound. empirical formula is the simplest ratio of components in the compound.
percentages of the elements have been given, so lets assume we are calculating for a compound of 100g
C H O
mass 63.13 g 8.830 g 28.03 g
molar mass 12 g/mol 1 g/mol 16 g/mol
number of moles 63.13/12 8.830/1 28.03/16
5.26 8.830 1.75
divide by the smallest number of moles
5.26/1.75 8.830/1.75 1.75/1.75
= 3.01 = 5.04 =1
rounded off to the nearest whole numbers
C - 3
H - 5
O - 1
therefore empirical formula = C₃H₅O

Q2)
we have to next determine the molecular formula of the compound
molecular formula gives the actual composition of elements in the compound.
since we know the empirical formula and molecular mass, we can find how many empirical units are in the molecular formula.
mass of empirical unit = Cx3 + Hx5 + Ox1
= 12 g/mol x 3 + 1g/mol x 5 + 16 g/mol x 1
= 36 + 5 + 16 = 57 g/mol
the molecular mass = 228 g/mol
then number of empirical units in the molecular formula = 228 / 57 = 4
therefore there are 4 empirical units
then the molecular formula = 4 x empirical formula =4 (C₃H₅O)
molecular formula = C₁₂H₂₀O₄

3 0

3 years ago

If pollution is increased, then the cricket frog population will (increase/decrease/stay the same) over the span of five years.

stepladder [879]

I am guessing it will decrease

4 0

2 years ago

Read 2 more answers

In tne equation below identify the bronsted lowry acid bronsted lowry base conjugate acid conjugate base

Ad libitum [116K]

Answer:

Brønsted-Lowry acid: HNO₂

Brønsted-Lowry base: NH₃

Conjugate acid: NH₄⁺

Conjugate base: NO₂⁻

Explanation:

The equation is:

$HNO_2(aq)+NH_3(aq)\rightarrow NH4^+(aq) + NO2^-(aq)$

Brønsted-Lowry acids are H⁺ donors.

Brønsted-Lowry bases are H⁺ acceptors.

Thus, on the left side, HNO₂ is the acid and NH₃ is the base.

The conjugate acids and conjugate bases are on the right side of the equation.

The conjugate acid is the spieces that is formed after a base accepts the proton; thus it is NH₄⁺. A conjugate acid contains one more H atom and one more + charge than the base that formed it.

The conjugate base is the species that is formed after the acid donates its proton; thus, NO₂⁻ is the conjugate base. A conjugate base contains one less H atom and one more - charge than the acid that formed it.

Summarizing:

Brønsted-Lowry acid: HNO₂

Brønsted-Lowry base: NH₃

Conjugate acid: NH₄⁺

Conjugate base: NO₂⁻

6 0

3 years ago

Predict the order of acid strengths in the following series of cationic

stich3 [128]

Answer:

CH3CH=NH2+>CH3CH2NH3+

Explanation:

If we look at the both species under review, we will realize that they are both amines hence they possess the polar N-H bond.

Electrons are ordinarily attracted towards the nitrogen atom hence making both compounds acidic. It is worthy of note that certain features of a compound may make it more acidic than another of close structural proximity. 'More acidic' simply means that the proton is more easily lost.

CH3CH=NH2+ contains an sp2 hybridized carbon atom which is highly electronegative and further withdraws electron density from the N-H bond thereby leading to a greater acidity of CH3CH=NH2+ compared to CH3CH2NH3+

5 0

3 years ago

When Thomas Edison first sold electricity, he used zinc coulometers to measure charge consumption. (In a coulometer the cathode

Troyanec [42]

When the zinc plate in one of Edison's coulometers increased in mass by 7.85 g, the amount of charge that had passed through it is 23,173 C.

<h3>Ionization of zinc</h3>

The zinc metal will ionize as shown below;

Zn²₊ + 2e⁻ → Zn

The molar mass of zinc metal is given as 65.38 g/mol

<h3>Amount of charge passed through 65.38 g/mol</h3>

Amount of charge that will deposite the given mass of zinc is calculated as follows;

e⁻ = 96500 C

2e⁻ = 2 x 96500 C = 193,000 C

<h3>Amount of charge passed through 7.85 g</h3>

65.38 g -------> 193,000 C

7.85 g -----------> ?

= (7.85 x 193,000)/(65.38)

= 23,173 C

Thus, when the zinc plate in one of Edison's coulometers increased in mass by 7.85 g, the amount of charge that had passed through it is 23,173 C.

Learn more about electrolysis here:brainly.com/question/25712870

4 0

2 years ago

Aluminium extraction from its ore​

Aluminium extraction from its ore