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Harrizon [31]
3 years ago
15

The major source of aluminum in the world this bauxite (mostly aluminum oxide). It’s thermal decomposition can be represented by

:
Al2 O3 (s) —> 2 Al (s) + 3/2 O2 (g)


ΔH rxn = 1676


If aluminum is produced this way, how many grams of aluminum can conform when 1.000×10^3 kJ of heat is transferred?
Chemistry
1 answer:
Artyom0805 [142]3 years ago
7 0

Answer:

The correct answer is 32.2 grams.

Explanation:

Based on the given information, the enthalpy of formation for aluminum oxide is 1676 kJ/mol. It signifies towards the energy that is required to generate aluminum and oxygen, and both of these exhibit zero enthalpy of formation. Therefore, the ΔHreaction is the required energy to generate 2 moles of aluminum. Thus, the energy needed for the formation of single mole of aluminum is,  

ΔHrxn = 1676/2 = 838 kJ/mol

Q or the energy input mentioned in the given case is 1000 kJ. Therefore, the number of moles of Al generated is,  

(1000 kJ) / (838 kJ/Al mole) = 1.19 moles of Aluminum

The grams of aluminum produced can be obtained by using the formula,  

mass = moles * molecular mass

= 1.19 * 26.98

= 32.2 grams.  

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In a reversible reaction, chemical equilibrium is attained when the (A) rate of the forward reaction is greater than the rate of
zepelin [54]

Answer:  (D) concentration of the products remains constant.

Explanation:

The reactions which do not go on completion and in which the reactant forms product and the products goes back to the reactants simultaneously are known as equilibrium reactions.

For a chemical equilibrium reaction, equilibrium state is achieved when the rate of forward reaction becomes equals to rate of the backward reaction.Equilibrium state is the state when reactants and products are present but the concentrations does not change with time.

Thus at chemical equilibrium, the amount of product and reactant remains constant because the rates of the forward and reverse reactions are equal.

A chemical equilibrium is dynamic in nature forward and backward reactions continue for indefinite time and never stops.

8 0
3 years ago
Compute 6.28x10^13+9.30x10^11
rodikova [14]

Solution:

The calculation is:

6.28 * 10^13 + 9.30 * 10^11  

6.28 * 10^2 * 10^11 + 9.30 * 10^11  

(628 + 9.30) * 10^11  

637.3 * 10^11


6 0
3 years ago
Read 2 more answers
If 1.10 g of steam at 100.0 °C condenses into 38.5 g of water, initially at 27.0 °C, in an insulated container, what is the fina
Gwar [14]

Answer:

Temperature = 44.02°C

Explanation:

Insulated container indicates no heat loss to the surroundings.

The specific heat capacity of a substance is a physical property of matter. It is defined as the amount of heat that is to be supplied to a unit mass of the material to produce a unit change in its temperature.

The SI unit of specific heat is joule per kelvin and kilogram, J/(K kg).

Now,

Specific heat for water is 4.1813 Jg⁻¹K⁻¹.

Latent heat of vaporization of water is 2257 Jg⁻¹.

Energy lost by steam in it's process of conversion to water, is the energy acquired by water resulting in an increase in it's temperature.

Q = mS \Delta T

Q= Heat transferred

m= mass of the substance

T= temperature

Also,

Q = mL

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Now applying the above equations to the problem:

m_{w} S_{w} (T-27) = (m_{s} L) + m_{s}S_{w} (100 -T)

38.5 \times 4.1813 \times (T-27) = (1.10 \times 2257) + 1.10 \times 4.1813 \times (100 -T)

Temperature = 44.02°C

8 0
3 years ago
Aqueous solutions of silver nitrate (AgNO3) and iron(III) chloride (FeCl3) are mixed together. Which ion combines with the chlor
garik1379 [7]
Hello there!

The correct answer is Ag⁺.

If we look at the solubility rules, it says that most chlorides are soluble, <u>except</u><em> </em>with Ag⁺, and Pb²⁺.

I hope this helps!
Brady<u><em /></u>
6 0
3 years ago
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What does the reaction rate measure?
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Answer:

It's C

Explanation:

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