Advertisements
Advertisements
प्रश्न
A sample of vitamic C is known to contain 2.58 ×1024 oxygen atoms. How many moles of oxygen atoms are present in the sample?
Advertisements
उत्तर
Number of oxygen atoms in the sample = 2.58 x 1024
= 2.58 × 1024
6.022 × 1023 atoms of oxygen = 1 mole
2.58 × 1024 atoms of oxygen = `(2.58 xx 10^24)/(6.022 xx 10^23)` moles
= 4.28 moles
APPEARS IN
संबंधित प्रश्न
TRUE \ FALSE
Elements having a tendency to accept electrons are called metals
WRITE SHORT ANSWER
What is radioactivity?
Write the names of the elements present in the following compound.
Common salt
Write the names of `"Na"_3"PO"_4` compounds :
Name two particles found inside the nucleus. What are they collectively called ?
What does the word ‘atom’ mean?
Define: An Atom:
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is such a particle called ?
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
Does the particle have an excess of electrons or a deficiency of electrons ?
In what respects do the three isotopes of hydrogen differ? Give their structures.
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form positive ion?
A radical take part – unsplit in a chemical reaction and retains its identity in reactions.
With reference to the radical –
- ammonium
- bisulphate
- carbonate
state the group of atoms present in each radical.
The electronic structure [configuration] of fluorine can be written as 2, 7. In a similar way give the electronic configuration of aluminium
The smaller particles found in the atom is called ______.
Define the following term with an example.
Metalloid
Which of the following statements made by Dalton has not undergone any change?
Atoms of different elements having the same number of ______ are called isotones.
You are provided with a fine white coloured powder which is either sugar or salt. How would you identify it without tasting?
Lead is also known as plumbum.
A small block slides down on a smooth inclined plane, starting from rest at time t = 0. Let Sn be the distance travelled by the block in the interval t = n – 1 to t = n. Then, the ratio `S_n/(S_(n + 1))` is ______.
