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Mariana [72]
2 years ago
12

The longest wavelength of light that causes electrons to be ejected from the surface of a potassium metal plate is 539 nm. If 40

0 nm radiation is shone on potassium, what is the velocity of the ejected electrons?
Chemistry
1 answer:
daser333 [38]2 years ago
7 0

Answer:The longest-wavelength light that causes an electron to be emitted from gaseous lithium atom is 520 nm.

Explanation:

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What us the % composition of oxygen (O) in iron (III) hydroxide, Fe(OH)<br> 3?
S_A_V [24]

Answer:

44.91% of Oxygen in Iron (III) hydroxide

Explanation:

To solve this question we must find the molar mass of Fe(OH)3 and the molar mass of the oxygen in this molecule. Percent composition will be:

<em>Molar mass Oxygen / molar mass Fe(OH)3 * 100</em>

<em />

<em>Molar mass Fe(OH)3 and oxygen:</em>

1Fe = 55.845g/mol*1 = 55.845

3O = 16.00g/mol*3 = 48.00 - Molar mass of Oxygen

3H = 1.008g/mol*3 = 3.024

55.845 + 48.00 + 3.024 =

106.869g/mol is molar mass of Fe(OH)3

% Composition of oxygen is:

48.00g/mol / 106.869g/mol * 100 =

<h3>44.91% of Oxygen in Iron (III) hydroxide</h3>
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2 years ago
What is a solution considered to be if it has a ph lower than 7?
wariber [46]
Anything less that 7, would be a base.
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3 years ago
Electric service has accumulated on an object is referred to as​
lara31 [8.8K]

Answer:

Static Electricity! :)

Explanation:

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How many kilometers are in a 7.21. mm
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What is an Atomic structure ?
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:) I hope this helped! :)

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3 years ago
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