Home
Class 11
CHEMISTRY
The mass number of three isotopes of an ...

The mass number of three isotopes of an element are 10,12,14 units. Their percentage aboundance is 80,15 and 5 units respectively. What is the atomic weight of the element?

A

`10.5`

B

`11.5`

C

`12.5`

D

`13.5`

Text Solution

Verified by Experts

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

Topper's Solved these Questions

Similar Questions

Explore conceptually related problems

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 ?

The mass number of three isotopes of an element are 11,12 and 13 .Their percentage ohandances 80,15 and 5 , respectively .What is the atomic weight of the element ?

The relative abundance of two isotopes of an element with atomic weight 85 and 87 is 75% and 25% respectively. Then calculate the average atomic weight of element

NARAYNA-ATOMIC STRUCTURE-All Questions
  1. Which of the follwong nuclear reactiosn will generate an isotope?

    Text Solution

    |

  2. Chlorine exists in two isotopic forms Cl-37 and Cl-35 but its atomic m...

    Text Solution

    |

  3. The mass number of three isotopes of an element are 10,12,14 units. Th...

    Text Solution

    |

  4. An ion with mass number 56 contains 3 units of positive charge and 30....

    Text Solution

    |

  5. The frequency of a wave light is 1.0 xx 10^(6)sec^(-1). The wave lengt...

    Text Solution

    |

  6. The energy per quantum associated with light of wave length 250 xx 10^...

    Text Solution

    |

  7. What is the energy of photons that corresponds to a wave number of 2.5...

    Text Solution

    |

  8. Nitrogen laser produces a radiation at a wavelength of 337.1nm. If the...

    Text Solution

    |

  9. The ratio of energies of photons with wavelength 2000A^(0) and 4000A^(...

    Text Solution

    |

  10. Electromagnetic radiation of wavelength 242 nm is just sufficient to i...

    Text Solution

    |

  11. When a metal is irradiated with light of frequency 4.0 xx 10^(16)s^(-1...

    Text Solution

    |

  12. In photo electric effect, if the energy required to over come the attr...

    Text Solution

    |

  13. The ratio of highest possile wavelength to lowest possible wavelength ...

    Text Solution

    |

  14. If the wave number of the first line in the Balmer series of hydrogen ...

    Text Solution

    |

  15. What is the lowest energy of the spectral line emitted by the hydrogen...

    Text Solution

    |

  16. The ionization energy of H atom is x kJ. The energy required for the e...

    Text Solution

    |

  17. The number of spectral lines obtain in Bohr spectrum of hydrogen at...

    Text Solution

    |

  18. The Ratio of m^(th) to n^(th) wavelength of Lyman series in H-spectrum...

    Text Solution

    |

  19. Which is the correct relationship? (a). E(1) of H=1//2E(2) of He^(+)=1...

    Text Solution

    |

  20. What is the wavelength of a photon emitted during a transition from n ...

    Text Solution

    |