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marshall27 [118]
2 years ago
13

What do you think about the Civil Rights Movement?

Chemistry
1 answer:
dimaraw [331]2 years ago
5 0
I don’t care about it tbh like I don’t even care about that stuff but the answer is 29272728
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What is the empirical formula of a compound containing 24.56% potassium, 34.81% manganese, and 40.50% oxygen? 
grin007 [14]
It would be the last anwer
6 0
3 years ago
Read 2 more answers
A laser pulse with wavelength 545 nm contains 4.85 mJ of energy. How many photons are in the laser pulse?
dusya [7]

<u>Given</u>:

Wavelength (λ) of the laser pulse = 545 nm = 5.45 * 10⁻⁹ m

Total energy of pulse = 4.85 mJ

<u>To determine:</u>

The number of photons in the laser of a given energy

<u>Explanation:</u>

Energy per photon (E) = hc/λ

where h = planck's constant = 6.626 *10⁻³⁴ Js

C = speed of light = 3*10⁸ m/s

λ = wavelength

E = 6.626 *10⁻³⁴ Js* 3*10⁸ms-1 /5.45 * 10⁻⁹ m = 3.65 * 10⁻¹⁹ J

Now,

# photons = total energy/Energy per photon

                 =  4.85 * 10⁻³ J* 1 photon / 3.65 * 10⁻¹⁹ J = 1.32 * 10¹⁶ photons

Ans: the laser pulse contains 1.32 * 10¹⁶ photons

3 0
3 years ago
Find the hydrogen ion concentration of a saturated solution of calcium hydroxide whose ph is 13. 1
salantis [7]

The pH of the solutions is 12.67.  

     

<h3>What is pH of a Solution?</h3>

pH is the measurement of how acidic or basic a solution is. The range of pH values is from 0 to 14. Lower pH values mean higher acidity, while higher pH means higher basicity. If the pH value is equal to 7, then the solution is neutral.

To calculate the pH of the solution, a few approaches are possible. Here, the pOH of the solution is calculated first using the molar concentration of  OH^{-1} ions. Because pH + pOH = 14, the pH of the solution can then be calculated by subtracting pOH from 14.

Because 2 moles of OH^{-1} ions are formed per mole of Ca(OH)_{2}dissolved, the pOH of a saturated Ca(OH)_{2} solution at  20^{.C} is,  

Concentration (C_{OH}) of OH^{-1} ions,

          C_{OH}   = 0.02335 mol Ca(OH)_{2}/L  X 2 mol OH^{-1} /1 mol Ca(OH)_{2}

            C_{OH} = 0.0467 mol OH^{-1}/L

*pOH of saturated Ca(OH)_{2} solution,

                                   pOH = -log [C_{OH}]

                                   pOH = -log [0.0467 mol OH^{-1}/L ]            

                                  pOH = 1.33  

*pH of saturated Ca(OH)_{2} solution,

                                   pH = 14 - 1.33

                                   pH = 12.67

Hence, the pH of the solutions is 12.67.

Learn more about  pH of the solutions here:

brainly.com/question/6988456

#SPJ4

4 0
2 years ago
Calculate the density in g/mL of 2.0 L of gasoline that weighs 1.29 kg . How would I do this?
fgiga [73]
M = 1,29kg=1290g
V = 2L = 2000mL

d = m / V = 1290g / 2000mL = 0,645 g/mL
3 0
3 years ago
What is the correct answer for the subtraction 28.645 g - 22.105 g? (considering significant figures)?
Sloan [31]
The answer is 6.54 when you calculate it. However, since out of the two numbers you used in the calculation, the number with the least number of decimal places has to be used for the answer, as well, which in this case is 3 decimal places. So, since 6.54 only has two decimal places and you need to make it three, just add a zero the end, thus making it 6.540. Final answer to the correct significant figures: 6.540
7 0
3 years ago
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