Home
Class 11
CHEMISTRY
Boron has two istopes B^(10) & B^(11) wh...

Boron has two istopes `B^(10)` & `B^(11)` whose relative abundances are `20%` & `80%` respectively avg.atomic weight of Boron is?

A

10

B

11

C

10.5

D

10.8

Text Solution

Verified by Experts

The correct Answer is:
D
`"Avg. at. wt " = (sum % "abundance" xx "Atomic weight")/("Total ratio")`
Promotional Banner

Topper's Solved these Questions

  • STRUCTURE OF ATOM

    NARAYNA|Exercise EXERCISE - II (H. W.) PLANK.S QUANTUM THEORY AND PHOTO ELECTRIC EFFECT|2 Videos

  • STRUCTURE OF ATOM

    NARAYNA|Exercise EXERCISE - II (H. W.) H-SPECTRUM|7 Videos

  • STRUCTURE OF ATOM

    NARAYNA|Exercise EXERCISE - II (C. W.) ELECTRONIC CONFIGURATIONS|3 Videos

  • STATES OF MATTER

    NARAYNA|Exercise A & R TYPE QUESTIONS|16 Videos

  • THERMODYNAMICS

    NARAYNA|Exercise Assertion- Reason|5 Videos

Similar Questions

Explore conceptually related problems

(a) Two stable isotope of ._3Li^6 and ._3Li^7 have respective abundances of 7.5% and 92.5% . These isotopes have masses 6.01512 and 7.01600 u respectively. Find the atomic weight of lithium. (b) Boron has two stable isotopes ._5B^(10) and ._5B^(11) . Their respective masses are 10.01294 u and 11.00931u, and the atomic weight of boron is 10.81u. Find the abundaces of ._5B^(10) and ._5B^(11) .

Assertion : Relative atomic mass of boron is 10.8 Reason : Boron has two isotopes B-10 and B-11 with percentage abundance of 19.6 % and 80.4 % respectively.

In each of the following two questions two statements are given one labelled as the Assertion(A) or Statement I and the other labelled as the reason (R) or statement II. Examine these statements carefully and mark the correct choice as per following instructions Assertion (A) - Relative atomic mass of boron is 10.8 Reason (R) - Boron has two isotopes B-10 and B-11 with percentage abundance of 19.6% and 80.4% respectively.

Natural boron is a mixture of two isotopes ""_(5)B^(10) and ""_(5)B^(11) of masses 10.003 amu and 11.009 amu, respectively. Calculate the atomic mass of natural boron if the relative abundance of ""_(5)B^(10) and ""_(5)B^(11) is 19.97% and 80.03%, respectively.

The mass numbers of three istopes of an element are 10,12 and 14 units .Their precentage abundance is 80,15 and 5 respectively .What is the atomic weight of the element ?