Chemistry, asked by adrianamizanie, 1 month ago

boron has two isotopes ,namely isotope "B and isotope 'B . based on the information below, calculate the nucleon number of isotope 'B.

relative atoms mass of boron=10.81
80% "B
20% isotope Boron-Y

Answers

Answered by Ashishchaturvedi
2

Explanation:

The atomic mass of boron is 10.81 u.

And 10.81 u is a lot closer to 11u than it is to 10u, so there must be more of boron-11.

To convince you fully, we can also do a simple calculation to find the exact proportion of boron-11 using the following formula:

(

10

u

)

(

x

)

+

(

11

u

)

(

1

x

)

100

%

=

10.81

u

Where u is the unit for atomic mass and x is the proportion of boron-10 out of the total boron abundance which is 100%.

Solving for x we get:

11

u

u

x

=

10.81

u

0.19

u

=

u

x

x

=

0.19

1

x

=

0.81

And thus the abundance of boron-11 is roughly 81%.

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