Home
Class 12
CHEMISTRY
What is the atomic weight of an element ...

What is the atomic weight of an element X for which a sample containing `1.58xx10^(22)` atoms weigh 1.05 g?

A

28 g

B

20 g

C

40 g

D

23 g

Text Solution

Verified by Experts

The correct Answer is:
C
We know that one mole of an element
`= 6. 02 xx 10^(23)` atoms
= atomic weight of the element
Now, `1.58xx 10^(22)` atoms weigh `.05` g
`therefore 6.02 xx 10^(23)` atoms weigh `= ((1.05xx6.02xx10^(23)))/(1.58 xx 10^(22)) = 40 ` g
Atomic weight of `X=40` g
Promotional Banner

Topper's Solved these Questions

  • SOME BASIC CONCEPTS OF CHEMISTRY

    MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS|Exercise EXERCISE 1|40 Videos

  • SOLUTIONS AND COLLIGATIVE PROPERTIES

    MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS|Exercise MHT CET Corner|25 Videos

  • STATES OF MATTER

    MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS|Exercise Exercise 2 (Miscellaneous Problems)|30 Videos

Similar Questions

Explore conceptually related problems

Calculate the number of moles of iron in a sample containing 10^(22) atoms of iron.

Which of the following samples does not contain a total of 1.8066xx10^24 atoms

What is the molecular weight of a substance, each molecule of which contains 9 carbon atoms, 13 hydrogen atoms and 2.33 xx 10^(-23) g of other component ?

Equals number of atoms are contained in one gram atomic weight of each element and the same number of molecules are found in one gram molecules weight of any compound . The terms gram atomic weight and gram molecular weight are used to refer to a fixed numer(Avogadro's number 6.022xx10^(23)) of particle. the term 'mole' stands for the amount of material which contains these number of particles. What will be the gram atomic weight of Mg if 24 g of ._(24)Mg^(24) contains 6.022 xx 10^(23) atoms?

If the atomic weight of an element is 23 times that of the lightest element and it has 11 protons, then it contains.

Find the number of g atoms and weight of an element having 2 xx 10^(23) atoms. Atomic mass of element is 32.

MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-SOME BASIC CONCEPTS OF CHEMISTRY-EXERCISE 2
  1. The number of sodium atoms in 2 moles of sodium ferrocyanide is

    Text Solution

    |

  2. The system thet contains the maximum number of atoms is

    Text Solution

    |

  3. 10^(21) molecules are removed from 200 mg of CO(2).The moles of CO(2) ...

    Text Solution

    |

  4. 1 mol of CH(4) contains

    Text Solution

    |

  5. The oxygen obtained form 72 kg of water is

    Text Solution

    |

  6. The weight of 112 m L of oxgen at NTP is

    Text Solution

    |

  7. Forr 14 g of CO, the wrong statement is

    Text Solution

    |

  8. The vapour denstiy of a gas is 11.2 The volume occupied by one gram of...

    Text Solution

    |

  9. What is the atomic weight of an element X for which a sample containin...

    Text Solution

    |

  10. The percentage of nitrogen in urea is about:

    Text Solution

    |

  11. Number of molecules in 1 L of water is close to

    Text Solution

    |

  12. The mass of 112 cm^(3) of CH(4) gas at STP is

    Text Solution

    |

  13. Cyclohexanol is dehydrated to cyclohexene on heating with conc. H(2) S...

    Text Solution

    |

  14. In the synthesis of ammonia N(2)(g)+3H(2)hArr2NH(3)(g) If the quan...

    Text Solution

    |

  15. A metal oxide has the formula A(2)O(3). It can be reduced by hydrogen ...

    Text Solution

    |

  16. How many moles of magnesium phosphate, Mg(3)(PO(4)(2) will contain 0.2...

    Text Solution

    |

  17. 20.0 kg of N(2)(g) and 3.0 kg of H(2)(g) are mixed to produce NH(3)(g)...

    Text Solution

    |

  18. The total number of electrons present in 18 mL of water is ……

    Text Solution

    |

  19. Stoichiometric ratio of sodium dihydrogen orthophosphate and sodium hy...

    Text Solution

    |

  20. Which of the following sets of compounds correctly ltbr. Illustrate th...

    Text Solution

    |