Advertisements
Advertisements
प्रश्न
Calculate the number of moles in 12.044 × 1025 atoms of phosphorus.
Advertisements
उत्तर
12.044 × 1025 atoms of phosphorus
6.022 × 1023 atoms of phosphorus = 1 mole
12.044 × 1025 atoms of phosphorus = 12.044 × 1025/6.022 × 1023 = 199.9 moles or 200 moles
Hence, 12.044 × 1025 atoms of phosphorus have 200 moles.
APPEARS IN
संबंधित प्रश्न
TRUE \ FALSE
Elements having a tendency to accept electrons are called metals
WRITE SHORT ANSWER
What is radioactivity?
ANSWER IN DETAIL
Enlist the features of Bohr’s model of an atom. How did he correct the Rutherford’s model ?
Write the names of the elements present in the:-
Acetic acid
Write the names of `"Na"_3"PO"_4` compounds :
What does an atom consist of ? Explain.
Give two examples for each of ionic and covalent bond.
An atom has 13 protons and 14 neutrons.
What is the atomic mass of the atom ?
Define: An Atom:
Fill in the blank
If an atom gains an electron, it is called an _______
Fill in the blank
A deficiency of electrons produces a ________ charge.
What is the usual symbol for (a) and electron (b) a proton, and (c) a neutron?
An atom of element E contains 3 protons, 3 electrons and 4 neutrons :
(a) What is its atomic number?
(b) What is its mass number?
(c) Write the electronic configuration of the element E.
(d) State whether element E is a metal or non-metal. Why?
(e) What type of ion, cation or anion, will be formed by an atom of element E? Why
(f) Write the symbol of the ion formed by an atom of element E.
(g) What could element X be?
Which has more atoms, 50 g of aluminium or 50 g of iron ? Illustrate your answer with the help of calculations.
(Atomic masses : Al = 27 u ; Fe = 25 u)
Draw diagrams representing the atomic structures of the following:
- Sodium atom
- Chlorine ion
- Carbon atom
- Oxygen ion
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which element will lose electron?
Select the correct answer to the statement given below:
Imaginary path around the nucleus of an atom in which electrons revolve.
A compound containing one atom of carbon and two atoms of oxygen is ______.
Write any two observations which support the fact that atoms are divisible.
An atom of Oxygen (O) and two atoms of hydrogen (H.) combine to form a molecule of ______.
