How have human activities affected mass wasting?

lions [1.4K]

Answer:

So... for the element of SODIUM, you already know that the atomic number tells you the number of electrons. That means there are 11 electrons in a sodium atom. Looking at the picture, you can see there are two electrons in shell one, eight in shell two, and only one in shell three.

Explanation:

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8 0

3 years ago

Read 2 more answers

The exhaust gas from an automobile contains 1.5 percent by volume of carbon monoxide. What is the concentration of CO in mg/m' a

FrozenT [24]

Answer:

(a) 17,178 mg/m3

(b) 11,625 mg/m3

Explanation:

The concentration of CO in mg/m3 can be calculated as

$C (mg/m3) =(P/RT)*MW*C_{ppm}$

For standard conditions (1 atm and 25°C), P/RT is 0.0409.

Concentration of 1.5% percent by volume of CO is equivalent to 1.5*10,000 ppm= 15,000 ppm CO.

The molecular weigth of CO is 28 g/mol.

(1) For 25°C and 1 atm conditions

$C=(P/RT)*MW*C_{ppm}\\\\C=0.0409*28*15,000=17,178$

(b) For 200°C and 1.1 atm,

$P/RT=0.0409*(P/P_{std})*(T_{std}/T)\\P/RT=0.0409*(1.1atm/1atm)*(273+15K/273+200K)=0.0277$

Then the concentration in mg/m3 is

$C=(P/RT)*MW*C_{ppm}\\\\C=0.0277*28*15,000=11,625$

5 0

3 years ago

Given the reactions,

enot [183]

The enthalpy change of the reaction is <u>-1347.8 kJ.</u>

<h3>What is the enthalpy change, ΔH, of the reaction?</h3>

The enthalpy change, ΔH, of the reaction is calculated from Hess's law of constant heat summation as follows:

Hess's law states that the enthalpy change of a reaction is the sum of the enthalpies of the intermediate reaction.

Given the reactions below and their enthalpy values;

1. X (s) + 12 O₂ (g)⟶ XO (s) ΔH₁ = −850.5 kJ

2. XCO₃ (s) ⟶ XO (s) + CO₂ (g) ΔH₂ = +497.3 kJ

The enthalpy change, ΔH, of the reaction whose equation is given below, will be:

X (s) + 12 O₂ (g) + CO₂ (g) ⟶ XCO₃ (s)

ΔH = ΔH₁ - ΔH₂

ΔH = − 850.5 kJ - (+497.3 kJ)

ΔH = -1347.8 kJ

Learn more about enthalpy change at: brainly.com/question/14047927

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7 0

2 years ago

need help in getting a element superhero and the element i choose is Helium can you give me some ideas of a superhero to make us

slava [35]

You could design the hero with the powers of helium which then u can describe why u made the character with thoose powers

3 0

3 years ago

Each year, due to growing population and energy demands, the United States faces increasing dependency on conventional fossil fu

laiz [17]

Answer:

A) (i) 4*10^12 Ibs , (ii) 600 * 10^9 Ibs

(iii)

Wind energy is a clean energy : this is because there is no consumption of fossil fuels when using wind energy to generate electricity
Wind energy is a renewable energy : wind is reusable and it is always available for use

B) The use of bricks or stone that can absorb the solar heat easily when the sun rays heat them up and this solar heat absorbed . is a typical example of a passive solar heating system.

C) Advantage : It is mostly cost free

disadvantage : there is no storage mechanism

Explanation:

A) Given that U.S uses roughly 4 million Gigawatt-hours per year in electricity and 50% of the electricity comes from coal

<u>i) Determine how much carbon dioxide is released from burning coal each year </u>

since 50% of electricity comes from coal

The Total energy produced by coal =2*10^12 Kw-h. also

1.0 kilowatt-hour of coal burned releases 2 lbs.

hence the Total amount of Carbon dioxide released from burning coal each year = 2 * 2 * 10^12 = 4 * 10^12 Ibs

<u>ii) Determine the reduction of carbon dioxide entering the atmosphere each year if coal usage could be reduced by 15% by utilizing solar energy</u>

= 15% 0f 4*10^12

reduction of coal usage by 15% = 600 * 10^9 Ibs hence the amount of coal entering the atmosphere is reduced by 600 * 10^9 Ibs

iii) Advantages of using wind energy to generate electricity

Wind energy is a clean energy : this is because there is no consumption of fossil fuels when using wind energy to generate electricity
Wind energy is a renewable energy : wind is reusable and it is always available for use

B) Passive solar heating system

The use of bricks or stone that can absorb the solar heat easily when the sun rays heat them up and this solar heat absorbed . is a typical example of a passive solar heating system.

C) advantage and disadvantage of solar heating system

Advantage : It is mostly cost free

disadvantage : there is no storage mechanism

5 0

3 years ago