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2 years ago

Which of these processes removes carbon from

Chemistry

1 answer:

GenaCL600 [577]2 years ago

3 0

Answer is c photosynthesis

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It takes 258 kJ/mol to eject electrons from a certain metal surface. What is the longest wavelength of light (nm) that can be us

Sergeeva-Olga [200]

Answer: The wavelength of light that can be used is 464 nm

Explanation:

We are given:

Energy of the electrons = 258 kJ/mol

This is the energy of the 1 mole of electrons

To calculate the energy of 1 electron, we divide the energy by Avogadro's number:

$\text{Energy of 1 electron}=\frac{E}{N_A}$

$N_A=6.022\times 10^{23}$

$E=258kJ/mol=2.58\times 10^5J/mol$ (Conversion factor: 1 kJ = 1000 J)

Putting values in above equation, we get:

$\text{Energy of 1 electron}=\frac{2.58\times 10^5}{6.022\times 10^{23}}=4.28\times 10^{-19}J$

To calculate the energy of one photon, we use Planck's equation, which is:

$E=\frac{hc}{\lambda}$

where,

h = Planck's constant = $6.625\times 10^{-34}J.s$

c = speed of light = $3\times 10^8m/s$

Energy of 1 electron = $4.28\times 10^{-19}J$

Putting values in above equation, we get:

$4.28\times 10^{-19}J=\frac{6.625\times 10^{-34}J.s\times 3\times 10^8m/s}{\lambda}\\\\\lambda=\frac{6.625\times 10^{-34}\times 3\times 10^8m/s}{4.28\times 10^{-19}}=4.64\times 10^{-7}m$

Converting this to nano meters, we use the conversion factor:

$1m=10^9nm$

So, $4.64\times 10^{-7}m\times \frac{10^9nm}{1m}=464nm$

Hence, the wavelength of light that can be used is 464 nm

3 0

3 years ago

What is the final pressure (expressed in atm) of a 3.05 l system initially at 724 mm hg and 298 k, that is compressed to a final

krok68 [10]

Answer:

P2 = 778.05 mm Hg = 1.02 atm

Explanation:

We are to find the final pressure (expressed in atm) of a 3.05 liter system initially at 724 mm hg and 298 K which is compressed to a final volume of 2.60 liter at 273 K.

For this, we would use the equation:

$\frac{P_1V_1}{T_1} =\frac{P_2V_2}{T_2}$

where P1 = 724 mm hg

V1 = 3.05 L

T1 = 298 K

P2 = ?

V2 = 2.6 L

T2 = 173 K

Substituting the given values in the equation to get:

$\frac{(724)(3.05)}{298} =\frac{P_2(2.6)}{173}$

P2 = 778.05 mm Hg = 1.02 atm

7 0

2 years ago

On order for a solute to dissolve in a solvent, what must be true ?

Elanso [62]

A I think if not sorry my bad

4 0

3 years ago

Which of the following is an example of chemical energy?

melisa1 [442]

Answer:

turning the tv

Explanation:

6 0

2 years ago

Read 2 more answers

I NEED HELP! :(

MariettaO [177]

Answer:

This is the answer if u are trying to figure out how far he walked

1530 meters

Explanation:

300+300+230+250+200+250=1530meter

5 0

3 years ago