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3 years ago

What is the mass of 5489 moles of selenium

2 answers:

6 0

To find the mass in grams of Selenium, you use the moles you have and multiply it by the molar mass.

5489 Moles Se * (79g Se / 1mole Se) =433631g of Se

Bogdan [553]3 years ago

4 0

Answer:

here...

Explanation:

To find the mass in grams of Selenium, you use the moles you have and multiply it by the molar mass.

5489 Moles Se * (79g Se / 1mole Se) =433631g of Se

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4 years ago

Write the isotopic symbol for the following (show your work) a) An isotope of iodine whose atoms have 78 neutrons b) An isotope

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Answer:

For a: The isotopic representation of iodine is $_{53}^{131}\textrm{I}$

For b: The isotopic representation of cesium is $_{55}^{137}\textrm{Cs}$

For c: The isotopic representation of strontium is $_{38}^{52}\textrm{Sr}$

Explanation:

The isotopic representation of an atom is: $_Z^A\textrm{X}$

where,

Z = Atomic number of the atom

A = Mass number of the atom

X = Symbol of the atom

For a:

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Number of neutrons = 78

Atomic number of iodine = 53 = Number of protons

Mass number = 53 + 78 = 131

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For b:

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Number of neutrons = 82

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Mass number = 55 + 82 = 137

Thus, the isotopic representation of cesium is $_{55}^{137}\textrm{Cs}$

For c:

We are given:

Number of neutrons = 52

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