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pishuonlain [190]

3 years ago

6

I need help with question 16 plz help i’m timed!!!!!

1 answer:

SSSSS [86.1K]3 years ago

7 0

Answer:

a

Explanation:

a

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Maru [420]

c is the answer to the question

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3 years ago

Which unit is used for measuring atomic mass?

Nadya [2.5K]

It is amu or dalton both meet the same definition.

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What happens to a reducing agent during a redox reaction?

Nuetrik [128]

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3 years ago

If an atom has 4 protons, 5 neutrons, and 4 electrons, what would its atomic mass be?

Rina8888 [55]

Answer:

4

Explanation:

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8 0

3 years ago

2.3 Zinc has five naturally occurring isotopes: 48.63% of 64 Zn with an atomic weight of 63.929 amu; 27.90% of 66Zn with an atom

lakkis [162]

<u>Answer:</u> The average atomic mass of element Zinc is 65.40 amu.

<u>Explanation:</u>

Average atomic mass of an element is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

Formula used to calculate average atomic mass follows:

$\text{Average atomic mass }=\sum_{i=1}^n\text{(Atomic mass of an isotopes)}_i\times \text{(Fractional abundance})_i$ .....(1)

<u>For $_{30}^{64}\textrm{Zn}$ isotope:</u>

Mass of $_{30}^{64}\textrm{Zn}$ isotope = 63.929 amu

Percentage abundance of $_{30}^{64}\textrm{Zn}$ isotope = 48.63 %

Fractional abundance of $_{30}^{64}\textrm{Zn}$ isotope = 0.4863

<u>For $_{30}^{66}\textrm{Zn}$ isotope:</u>

Mass of $_{30}^{66}\textrm{Zn}$ isotope = 65.926 amu

Percentage abundance of $_{30}^{66}\textrm{Zn}$ isotope = 27.90 %

Fractional abundance of $_{30}^{66}\textrm{Zn}$ isotope = 0.2790

<u>For $_{30}^{67}\textrm{Zn}$ isotope:</u>

Mass of $_{30}^{67}\textrm{Zn}$ isotope = 66.927 amu

Percentage abundance of $_{30}^{67}\textrm{Zn}$ isotope = 4.10 %

Fractional abundance of $_{30}^{67}\textrm{Zn}$ isotope = 0.0410

<u>For $_{30}^{68}\textrm{Zn}$ isotope:</u>

Mass of $_{30}^{68}\textrm{Zn}$ isotope = 67.925 amu

Percentage abundance of $_{30}^{68}\textrm{Zn}$ isotope = 18.75 %

Fractional abundance of $_{30}^{68}\textrm{Zn}$ isotope = 0.1875

<u>For $_{30}^{70}\textrm{Zn}$ isotope:</u>

Mass of $_{30}^{70}\textrm{Zn}$ isotope = 69.925 amu

Percentage abundance of $_{30}^{70}\textrm{Zn}$ isotope = 0.62 %

Fractional abundance of $_{30}^{70}\textrm{Zn}$ isotope = 0.0062

Putting values in equation 1, we get:

$\text{Average atomic mass of Zinc}=[(63.929\times 0.4863)+(65.926\times 0.2790)+(66.927\times 0.0410)+(67.925\times 0.1875)+(69.925\times 0.0062)]$

$\text{Average atomic mass of Zinc}=65.40amu$

Hence, the average atomic mass of element Zinc is 65.40 amu.

7 0

3 years ago