Volaic cells produce a positive overall charge what does this indicate

If a laser light is compose of photons each with an energy of 4.58 × 10−19 J, what is the photon energy of this light in units o

kap26 [50]

Answer : The photon energy of this light in units of nanometers, (nm) is, $4.34\times 10^{-2}nm$

Solution :

Formula used :

$E=\frac{h\times c}{\lambda}$

where,

E = energy of photon = $4.58\times 10^{-19}J$

h = Planck's constant = $6.626\times 10^{-34}Js$

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

$\lambda$ = wavelength = ?

Now put all the given values in the above formula, we get:

$4.58\times 10^{-19}J=\frac{(6.626\times 10^{-34}Js)\times (3\times 10^8m/s)}{\lambda}$

$\lambda=4.3017\times 10^{-7}m=434.017\times 10^{-9}m=434.017nm=4.34\times 10^{-2}nm$

conversion used : $(1nm=1\times 10^{-9}m)$

Therefore, the photon energy of this light in units of nanometers, (nm) is, $4.34\times 10^{-2}nm$

5 0

3 years ago

Identify indicators of a chemical reaction. Check all of the boxes that apply.

Marina CMI [18]

All except for absorption of heat

4 0

1 year ago

What is the name of 2NaI?

pishuonlain [190]

<span>The name of 2Nal is Sodium Iodide. It is an ionic compound used to treat iodine deficiency. It is used as a nutritional supplement in salt form. Sodium iodide can also be used for conversion of an alkyl chlorides into an alkyl iodides. Some types of Sodium Iodide can be use din the treatment of thyroid cancer and hyperthyroidism .</span>

7 0

3 years ago

Read 2 more answers

Define a function ComputeGasVolume that returns the volume of a gas given parameters pressure, temperature, and moles. Use the g

andre [41]

Answer: A function can be defined as a relation in which one thing is dependent on another for its value.

Explanation: Given R = 8.314J/mol*k

PV = nRT

V = nRT/ P

V = 8.314RT / P (cm^3)

Volume of gas =(( 8.314 * R* T) / P ) cm3

7 0

4 years ago

Write the balanced neutralization reaction that occurs between H 2 SO 4 and KOH in aqueous solution. Phases are optional. neutra

Mariulka [41]

Answer:

0.168 M

Explanation:

First, this is a reaction between the a strong base and a strong acid, therefore, we do not have to count with the acid constant of equilibrium. This reaction is taking place completely and occurs a neutralization, which is the following reaction:

H₂SO₄(aq) + 2KOH(aq) <------> K₂SO₄(s) + 2H₂O(l)

Now that we have the reaction, we can go to the second part of the question.

To calculate the remaining concentration after neutralization, we need to calculate the moles of the reactants and determine which is the limiting reactant.

The moles of the reactants:

moles A = 0.42 * 0.15 = 0.063 moles

moles B = 0.210 * 0.1 = 0.021 moles

Now that we have the moles, let's calculate the limiting reactant:

H₂SO₄(aq) + 2KOH(aq) <------> K₂SO₄(s) + 2H₂O(l)

If:

1 moles A ---------> 2 moles B

0.063 A -----------> X

X = 0.063 * 2 = 0.126 moles of B

However, we only have 0.021 moles of base, so, this is the limiting reactant.

Now that we know this, let's see the remaining moles of the acid, after the base reacts completely:

moles of A remaining = 0.063 - 0.021 = 0.042 moles

Finally to get the concentration, we have the volume of acid and the base together, so, the final volume is 0.25 L:

C = 0.042 / 0.25 = 0.168 M

This is the final concentration of the acid

3 0

3 years ago