Question

define mole and Polyatomic ion with proper example​

Answer 1

Answer:

Mole -A mole corresponds to the mass of a substance that contains 6.023 x 1023 particles of the substance. The mole is the SI unit for the amount of a substance. Its symbol is mol. By definition: 1 mol of carbon-12 has a mass of 12 grams and contains 6.022140857 x 1023 of carbon atoms (to 10 significant figures).

Polyatomic ion - Polyatomic ions are ions which consist of more than one atom. For example, nitrate ion, NO3-, contains one nitrogen atom and three oxygen atoms. The atoms in a polyatomic ion are usually covalently bonded to one another, and therefore stay together as a single, charged unit.

Answer 2

Answer:

$3 {3 {3yy = = 3yy - \times \times x { \times \times {1 \times 3313 { \times {31x1 = 3y {3 {3 { {33333 \times \frac{?}{?} }^{?} }^{?} }^{?} }^{?} }^{?} }^{?} }^{?} }^{?} }^{?} }^{?}$

Explanation:

${ - { \times 3 { \times 33}^{?} }^{?} }^{?}$