All categories

3 years ago

Which factor is difficult to assess in a cost–benefit analysis?

Chemistry

2 answers:

marshall27 [118]3 years ago

8 0

Answer:

the static value of nature

Explanation:

hope it will help you please thanks my answer and follow me

rosijanka [135]3 years ago

7 0

Answer:

it's A

Explanation:

product being used by everyone

hope it helps!

You might be interested in

Which one of the following sets of units is appropriate for a second-order rate constant?A. s-1B. mol L-1 s-1C. L mol-1 s-1D. mo

Korolek [52]

Answer:

Explanation:

A second order reaction is one in which the reaction rate is proportional to the concentrations of the 2 reactants. We only consider the reactants whose concentration are changing however.

For example, in the case:

A + B ----> C + D , provided that both A and B undergo concentration changes, the rate is proportional to the product of their concentrations.

Now, like we know, the unit of the reaction rate is per second I.e 1/s or simply s^-1 . Also it is important to note that the concentration of the reactants is exprested in units of mol/L. We can now mathematically calculate the unit of the rate constant.

Mathematically,

R = k × [A] [B]

Hence,

S^-1 = k × (mol/L)(mol/L)

s^-1 = k × (mol/L)^2

K = s^-1 ÷ (mol/L)^2

K = s^-1 × L^2 × mol^-2.

6 0

3 years ago

Which of the following is not one of the four environmental spheres in which all of the Earth’s physical and natural processes o

Semenov [28]

The answer is C i’ve got this question and the answer was C , hope this helps.

3 0

3 years ago

Read 2 more answers

a water heater contains 58 Gal of water. How many kilowatt-hours of energy are necessary to heat the water in the water heater b

Citrus2011 [14]

Answer:

6.45 KWh

Explanation:

Data given:

amount of water = 58 gallon

Convert gallons to L

1 gallon = 3.78541 L

58 gallon = 58 x 3.78541 = 220 L

change in temperature = 25 °C

kilowatt-hours of energy = ?

Solution:

First we have to change volume of water into mass

following formula will use

m = d x v . . . . . . (1)

as we know

density of water = 1000 g/L

Put values in equation 1

m = 1000 g/L x 220 L

m = 220000

To calculate heat we use following formula

Q = m.c.ΔT . . . . . . . . . . (2)

Where

m= mass

c = specific heat of water

specific heat of water = 4.186 J/g °C

ΔT = change in temperature

Put values in equation 1

Q = 220,000 g x 4.186 J/g °C x 25 °C

Q = 23023000 J

As we need this value in kilowatt-hours of energy so we convert J to KWh

1 J = 2.8 x 10⁻⁷ KWh

23023000 J = X KWh

Do cross multiplication

KWh = 23023000 J x 2.8 x 10⁻⁷ KWh / 1 J

KWh = 6.45 KWh

6.45 KWh (kilowatt-hours) of energy are needed to heat the water in the water heater.

3 0

3 years ago

If there are 1.55 x 1024 molecules of hydrogen peroxide (H2O2), what is the mass of the<br>sample?

bezimeni [28]

Answer:

87.54 g of H₂O₂

Explanation:

From the question given above, the following data were obtained:

Number of molecules = 1.55×10²⁴ molecules

Mass of H₂O₂ =.?

From Avogadro's hypothesis,

6.02×10²³ molecules = 1 mole of H₂O₂

Next, we shall determine the mass of 1 mole of H₂O₂. This can be obtained as follow:

1 mole of H₂O₂ = (2×1) + (2×16)

= 2 + 32

= 34 g

Thus,

6.02×10²³ molecules = 34 g of H₂O₂

Finally, we shall determine mass of H₂O₂ that contains 1.55×10²⁴ molecules. This can be obtained as follow:

6.02×10²³ molecules = 34 g of H₂O₂

Therefore,

1.55×10²⁴ molecules

= (1.55×10²⁴ × 34)/6.02×10²³

1.55×10²⁴ molecules = 87.54 g of H₂O₂

Thus, 87.54 g of H₂O₂ contains 1.55×10²⁴ molecules.

8 0

2 years ago

There are many compounds that contribute to the overall aroma of a banana. The primary compound is called isoamyl acetate and co

Murljashka [212]

Explanation:

Let the mass of isoamyl acetate be 100g.

Moles of Carbon = 60.58/12 = 5.048mol

Moles of Hydrogen = 7.07/1 = 7.07mol

Moles of Oxygen = 32.28/16 = 2.018mol

Mole Ratio of C : H : O

= 5.048 : 7.07 : 2.018

= 5 : 7 : 2.

Hence the empirical formula of isoamyl acetate is C5H7O2.

8 0

2 years ago