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pogonyaev
3 years ago
5

1.) How can atomic number and mass number be used to find the numbers of protons, electrons, and neutrons?

Chemistry
1 answer:
Contact [7]3 years ago
5 0
I think Atomic mass minus Atomic number is the number of protons
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How many moles of potassium are in 3.78 x 10^21 atoms of K?
lbvjy [14]

Answer: 6.3 x 10^-3 moles

Explanation:

Based on Avogadro's law:

1 mole of any substance has 6.02 x 10^23 atoms

So, 1 mole of potassium = 6.02 x 10^23 atoms

Z moles = 3.78 x 10^21 atoms

To get the value of Z, we cross multiply:

(3.78 x 10^21 atoms x 1mole) = (6.02 x 10^23 atoms x Z moles)

3.78 x 10^21 = (6.02 x 10^23 x Z)

Z = (3.78 x 10^21) ➗ (6.02 x 10^23)

Z = 0.63 x 10^-2)

Place the result in standard form

Hence, Z = 6.3 x 10^-3 moles

Thus, there are 6.3 x 10^-3 moles of potassium in 3.78 x 10^21 atoms of K.

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3 years ago
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4 0
3 years ago
I would like some assistance
charle [14.2K]

Answer:

#2.

Explanation:

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