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
Write the names of the elements present in the following compound.
Common salt
Write the names of `"FeS"` compounds :
Name the particles which revolve around the nucleus.
Write electronic configuration of oxygen, fluorine, sodium, silicon, argon.
An atom has 13 protons and 14 neutrons.
What is the atomic number of the atom ?
Fill in the blank
If an atom loses an electron, it acquires ______ a charge.
Fill in the blank
An _______ is electrically neutral.
Name the three subatomic particles present in an atom.
How many times is a proton heavier than an electron?
One nm is equal to :
For the symbols H, D and T, write the subatomic particles (protons, neutrons and electrons) found in each one of them.
How many atoms are there in exactly 12 g of carbon-12 element ? (C = 12 u)
Give scientific reason.
All the mass of an atom is concentrated in the nucleus.
Define the following term:
Atom
The electron shell ______ is nearest to the nucleus.
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.
Name the sub-atomic particles.
An atom of an element has no electron. Will that atom have any mass or not? Can an atom exist without electron? If so then give example.
Define the following term with an example.
Metalloid
In the nucleus of `""_20"Ca"^40`, there are ______
