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Structure of the Atom

The average atomic mass of a sample of an element X is 16.2 u.

Science

Class 9

NCERT

Chapter 1: Matter in Our Surroundings

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Chapter 2: Is Matter Around Us Pure?

13 questions

Chapter 3: Atoms and Molecules

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Chapter 4: Structure of the Atom

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If bromine atom is available in the form of, say, two isotopes

_{35}^{79} B r

(49.7%) and

_{35}^{81} B r

(50.3%), calculate the average atomic mass of bromine atom.

The average atomic mass of a sample of an element

X

16.2 u

. What are the percentages of isotopes

_{8}^{16} X

and

_{8}^{18} X

in the sample?

Z = 3

, what would be the valency of the element? Also, name the element.

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Question

Easy

Solving time: 3 mins

The average atomic mass of a sample of an element $X$ is $16.2 u$ . What are the percentages of isotopes $_{8}^{16} X$ and $_{8}^{18} X$ in the sample?

Views: 5,987 students

Updated on: Feb 27, 2024

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Science (NCERT)

Found 4 tutors discussing this question

Charlotte Discussed

The average atomic mass of a sample of an element

X

16.2 u

. What are the percentages of isotopes

_{8}^{16} X

and

_{8}^{18} X

in the sample?

5 mins ago

Discuss this question LIVE

5 mins ago

Text solutionVerified

Let the percentage of

_{8}^{16} X

A

%. Then the percentage of

_{8}^{18} X

(100 - A)

∴

16 \times \frac{A}{100} + 18 \times \frac{100 - A}{100} = 16.2

⟹ 1800 - 2 A = 1620

⟹ A = 90

So the answer is 90%

_{8}^{16} X

and 10%

_{8}^{18} X

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Practice more questions from Science (NCERT)

If bromine atom is available in the form of, say, two isotopes

_{35}^{79} B r

(49.7%) and

_{35}^{81} B r

(50.3%), calculate the average atomic mass of bromine atom.

The average atomic mass of a sample of an element

X

16.2 u

. What are the percentages of isotopes

_{8}^{16} X

and

_{8}^{18} X

in the sample?

Z = 3

, what would be the valency of the element? Also, name the element.

View all

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Question Text	The average atomic mass of a sample of an element $X$ is $16.2 u$ . What are the percentages of isotopes $_{8}^{16} X$ and $_{8}^{18} X$ in the sample?
Updated On	Feb 27, 2024
Topic	Structure of the Atom
Subject	Science
Class	Class 9
Answer Type	Text solution:1 Video solution: 27
Upvotes	3048
Avg. Video Duration	5 min

The average atomic mass of a sample of an element $X$ is $16.2 u$ . What are the percentages of isotopes $_{8}^{16} X$ and $_{8}^{18} X$ in the sample?

Text solutionVerified

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