Download App

Atoms and Molecules — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceAtoms and Molecules1 Mark
MCQ
8 g of He is equal to:
  • A
    4 moles.
  • B
    12.044 × 1023 atoms.
  • C
    1.2044 × 1023 atoms.
  • D
    3 × 1023 atoms.
✓

Answer

  1. 12.044 × 1023 atoms.

Explanation:

8g of he = 2 moles of He aprox (1 mole of he = 4.003g) 

= 2 × 6.0221 × 1023

(1 mole is amount of substance that contains avogadro no. of particles) 

= 12.0442 × 1023 atoms.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q-[Che-1M]" from Atoms and Molecules→Atoms and Molecules — all question types→Science STD 9 question papers→CBSE Board STD 9 question papers→CBSE Board question paper generator→

Similar questions

Value representing the number of protons in an element:
→
The five basic elements that the matter is thought to be made of is:
→
The atom as a whole is electrically neutral", is a statement proposed by which atomic model:
→
Which of the following statements is not true:
→
Which of the following pair of elements represents a mole ratio of 1 : 1?
→
The boiling points of diethyl ether, acetone and n-butyl alcohol are 35°C, 56°C and 118°C, respectively. Which one of the following correctly represents their boiling points in kelvin scale:
→
An atom with 3 protons and 4 neutrons will have a valency of:
→
In order to verify the law of conservation of mass, we carry out chemical reactions in a closed container, so that:
→
Evaporation occurs only:
→
Which of the following statement is true about Rutherford’s experiment:
→