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1 year ago

What are the 4 most abundant minerals in the continental crust? What percentage do these 4 makeup of the total?

Chemistry

1 answer:

Tanya [424]1 year ago

5 0

Answer:

$SiO_2$ , $Al_2O_3$ , $CaO$ , $MgO$

Explanation:

The four most abundant minerals in the continental crust are, $SiO_2$ , $Al_2O_3$ , $CaO$ , $MgO$ .

The percentages are

$SiO_2=60.6\%$

$Al_2O_3=15.9\%$

$CaO=6.4\%$

$MgO=4.7\%$

$SiO_2$ is called quartz

$Al_2O_3$ is called corundum

$CaO$ is called calcium oxide or quick lime

$MgO$ is called magnesium oxide or magnesia

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How much heat is released during the formation of 3.18 mol HCl(g) in this reaction: H2(g)+Cl2(g) → 2HCl(g) with a H of -184.6 kJ

Vikentia [17]

The given thermochemical reaction is between hydrogen gas and chlorine gas to form hydrogen chloride.

This can be represented as:

$H_{2}(g)+Cl_{2}(g)-->2HCl(g)$ Δ $H_{reaction}^{0}$ =-184.6 kJ/mol

So when two moles of HCl is formed, 184.6 kJ of energy is released.

Calculating the heat released when 3.18 mol HCl (g) is formed in the reaction:

$3.18 molHCl*\frac{184.6kJ}{2molHCl} =293.5 kJ$

Therefore, 293.5 kJ of heat is released when 3.18 mol HCl is formed in the reaction between hydrogen and chlorine.

4 0

2 years ago

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The structure of carbonic acid, an important component of ocean chemistry, is depicted below. What type of model best describes

BabaBlast [244]

Answer: Option (c) is the correct answer.

Explanation:

A physical model is defined as a model which represents how atoms are bonded together and structure of a molecule.

Physical model shows the three dimensional structure of a molecule. Physical models helps to easily understand and visualize the configuration, single bonds, double bonds and total atoms within a molecule.

Thus, we can conclude that given structure of carbonic acid best describes a physical model.

4 0

2 years ago

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Write equations that show the processes that describe the first, second, and third ionization energies for a gaseous iron atom.

Nikolay [14]

The ionization energy of an element is the amount of energy required to remove one mole of electrons from the element in its gaseous state. The equations for the first three are:

Fe(g) → Fe⁺(g) + e⁻

Fe⁺(g) → Fe⁺²(g) + e⁻

Fe⁺²(g) → Fe⁺³(g) + e

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1 year ago

Octane is a liquid component of gasoline. Given the following vapor pressures of octane at various temperatures, estimate the bo

Hitman42 [59]

Answer:

110.8 ºC

Explanation:

To solve this problem we will make use of the Clausius-Clayperon equation:

lnP = - ΔHºvap/RT + C

where P is the pressure, ΔHºvap is the enthalpy of vaporization, R is the gas constant, T is the temperature, and C is a constant of integration.

Now this equation has a form y = mx + b where

y = lnP

x = 1/T

m = -ΔHºvap/R

Now we have to assume that ΔHºvap remains constant which is a good asumption given the narrow range of temperatures in the data ( 104-125) ºC

Thus what we have to do is find the equation of the best fit for this data using a software as excel or your calculator.

T ( K) 1/T ln P

377 0.002653 5.9915

384 0.002604 6.2115

390 0.002564 6.3969

395 0.002532 6.5511

398 0.002513 6.6333

The best line has a fit:

y = -4609.5 x + 18.218

with R² = 0.9998

Now that we have the equation of the line, we simply will substitute for a pressure of 496 mm in Leadville.

ln(496) = -4609.5(1/Tb) + 18.218

6.2066 = -4609.5(1/Tb) +18.218

⇒ 1/Tb = (18.218 - 6.2066)/4609.5 = 0.00261

Tb = 383.76 K = (383.76 -273)K = 110.8 ºC

Notice we have touse up to 4 decimal places since rounding could lead to an erroneous answer ( i.e boiling temperature greater than 111, an impossibility given the data in the question). This is as a result of the value 496 mmHg so close to 500 mm Hg.

Perhaps that is the reason the question was flagged.

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2 years ago

Which of these objects will most likely float? A. An object whose volume is greater than its mass B. A cruise ship that weighs 5

weeeeeb [17]

I would say D. Because if you displace too much water it would would either go to fast or not move at all... that's just my thought

6 0

2 years ago

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