Suppose you have 897 sheets of paper. how many moles of paper do you have?

Consider the following definitions.
1 doz = 12
1 gross = 144
1 ream = 500
1 mol = 6.022×1023
Suppose you have 897 sheets of paper.

Explanation:

1 mole of a substance is defined as the amount of substance containing a number of units of the substance equal to the Avogadro number:

This means that 1 mole of paper will contain a number of sheets equal to the Avogadro number,

In this case, instead, the number of sheets in this amount of paper is

N = 897

Which corresponds to n moles.

Therefore, we can solve the problem by using the rule of three:

And solving for n,

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."

it means there are 3 atoms of oxygen