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3 years ago

5

A sodium flame has a characteristic yellow color due to emissions of wavelength 589 nm. What is the mass equivalence of one phot

on of this wavelength (1 J = 1 kg·m²/s²)?

1 answer:

Sladkaya [172]3 years ago

8 0

I really don’t know but I’ll tell you soon

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The enthalpy change for converting 1.00 mol of ice at -50.0°c to water at 70.0°c is __________ kj. the specific heats of ice, wa

kogti [31]

First, calculate for the amount of heat used up for increasing the temperature of ice.

H = mcpdT
H = (18 g)*(2.09 J/g-K)(50 K) = 1881 J

Then, solve for the heat needed to convert the phase of water.
H = (1 mol)(6.01 kJ/mol) = 6.01 kJ = 6010 J

Then, solve for the heat needed to increase again the temperature of water.
H = (18 g)(4.18 J/gK)(70 k)
H = 5266.8 J

The total value is equal to 13157.8 J

Answer: 13157.8 J

8 0

3 years ago

You drop an unknown substance that weighs 8.3g into a graduated cylinder with 6ml of water. The water rises to 8ml when you drop

valkas [14]

Answer:

<h3>The answer is 4.15 g/mL</h3>

Explanation:

The density of a substance can be found by using the formula

$density = \frac{mass}{volume} \\$

From the question

mass of object = 8.3 g

volume = final volume of water - initial volume of water

volume = 8 - 6 = 2 mL

So we have

$density = \frac{8.3}{2} \\$

We have the final answer as

<h3>4.15 g/mL</h3>

Hope this helps you

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3 years ago

Enter the maximum number of electrons in each type of sublevel (s, p, d, and f, respectively)

Ksivusya [100]

The maximum number of electrons:
- s sublevel: 2 electrons,
- p sublevel: 6 electrons,
- d sublevel: 10 electrons,
- f sublevel : 14 electrons.

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3 years ago

(2k-1)²<br> what the answer pls.

Sedaia [141]

Answer:

4k^2-4k+1

Explanation:

Plx give brainlyest

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2 years ago

Which of the following statements is true?

soldier1979 [14.2K]

The answer for question 14 would be C and question 15 is B

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3 years ago