Home
Class 12
CHEMISTRY
An element X has the following isotopic ...

An element X has the following isotopic composition:
`.^(200)X:90% .^(199)X:8.0% .^(202)X:2.0%`
The weight average atomic mass of the naturally occurring element X is closest to

A

200 amu

B

201 amu

C

202 amu

D

199 amu

Text Solution

Verified by Experts

The correct Answer is:
C
Avg. atomic mass `=(200xx90+199xx8+302xx2)/100`
`=201.96 ~~ 202` amu.
Promotional Banner

Topper's Solved these Questions

  • SOME BASIC CONCEPTS OF CHEMISTRY

    ERRORLESS |Exercise Ordinary Thinking (Objective Questions) The mole concept|43 Videos

  • SOME BASIC CONCEPTS OF CHEMISTRY

    ERRORLESS |Exercise Ordinary Thinking (Objective Questions) Chemical stochiometry|42 Videos

  • SOME BASIC CONCEPTS OF CHEMISTRY

    ERRORLESS |Exercise JEE Section (Matrix Match type questions)|3 Videos

  • SOLUTION

    ERRORLESS |Exercise JEE SECTION (JEE (Advanced)2018) (Numeric answer type questions)|3 Videos

  • THERMODYNAMICS AND THERMOCHEMISTRY

    ERRORLESS |Exercise JEE section (JEE (Advanced) 2018) Numeric answer type questions|2 Videos

Similar Questions

Explore conceptually related problems

An element X has the following isotopic composition : .^(200)X:90%," ".^(199)X:8.0%," ".^(202)X:2.0% The weighted average atomic mass of the naturally occurring element X is closest to :

An element X has the following istopic compositon: .^(200)X(90%), .^(199)X(8.0%), .^(202)X(2.0%) The weighted average atomic mass of the naturally occuring element X is closent to

An element X has the following isotopic composition .^(200)X : 90%, .^(199)X: 8.0%, .^(202)X:2% . The Weighed average atomic mass of naturally occurring element X is closet to

An element, X has the following isotopic composition ""^(56)X : 90% ""^(57)X : 8% ""^(57)X: 2.0% . The weighted average atomic mass of the naturallyoccurring element X is closest to

0.25 gram atom of an element weighs 45.2 g. The atomic mass of the element X is

A sample of an element X contains two isotopes ._(8)^(16)X and ._(8)^(18)X . If the average atomic mass of this sample of the element be 16.2 u, calculate the percentage of the two isotopes in this sample.

(a) What are radioactive isotopes ? Give two examples of radioactive isotopes (b) Give any two uses of ratioactive isotopes (c) An element Z contains two naturally occuring isotopes ._(17)^(35) Z and ._(17)^(37)Z . If the average atomic mass of this element be 35.5 u, calculate the percentage of two isotopes.

ERRORLESS -SOME BASIC CONCEPTS OF CHEMISTRY-Ordinary Thinking (Objective Questions) Atomic, Molecular and Equivalent masses
  1. The number of atoms in 4.25 g of NH(3) is approximately

    Text Solution

    |

  2. Assuming fully decomposed, the volume of CO(2) released at STP on heat...

    Text Solution

    |

  3. An element X has the following isotopic composition: .^(200)X:90% .^...

    Text Solution

    |

  4. The weight of a molecule of the compoundC(60)H(122) is

    Text Solution

    |

  5. The number of molecules in 8.96L of a gas at 0^(@)C and 1 atmosphere p...

    Text Solution

    |

  6. What is the concentration of nitrate ions if equal volumes of 0.1 M Ag...

    Text Solution

    |

  7. 74.5 g of a metallic chloride contain 35.5 g of chlorine. The equivale...

    Text Solution

    |

  8. When potassium permanganate is titrated against ferrous ammonoum sulph...

    Text Solution

    |

  9. 0.75 g platinic chloride, a monoacid base on ignition gave 0.245 g pla...

    Text Solution

    |

  10. In acidic medium, equivalent weight of K(2)Cr(2)O(7) (molecular weight...

    Text Solution

    |

  11. The numbe of moles of oxygen obtained by the electrolytic decompositio...

    Text Solution

    |

  12. The number of equivalents of N(2)S(2)O(3) required for the volumetric ...

    Text Solution

    |

  13. The percentage of element M is 53 in its oxide of molecular formula M(...

    Text Solution

    |

  14. A metal M of equivalent mass E forms an oxide of molecular formula M(x...

    Text Solution

    |

  15. Arrange the following in the order of increasing mass (at. Mass of O=1...

    Text Solution

    |

  16. What is the volutme of CO(2) liberted in litres at 1 atmosphere and 0^...

    Text Solution

    |

  17. When 100 ml 1N-NaOH solution and 10 ml of 10 N sulphuric acid solution...

    Text Solution

    |

  18. 1.520 g of the hydroxide of a metal on ignition gave 0.995 g of oxide....

    Text Solution

    |

  19. The equivalent weight of a metal is 9 and vapour density of its chlori...

    Text Solution

    |

  20. On reduction with hydrogen, 3.6 g of an oxide of matel left 3.2 g of m...

    Text Solution

    |