Asample of a compound contains 65.4 grams of zinc, 12.0 grams of carbon, and 48.0 grams of oxygen. what is the mole ratio of zinc to carbon
to oxygen in this compound?
(1) 1: 1: 2 (3) 1: 4: 6
(2) 1: 1: 3 (4) 5: 1: 4

2) 1:1:3

Explanation: First of all the given grams of each element are converted to moles and for this we divide the grams of an element by its atomic mass.

Atomic masses of Zn, C and O are as follows:

Zn = 65.4

C = 12.0

O = 16.0

moles of Zn =  = 1

moles of C =  = 1

moles of O = = 3

To get the mole ratio we divide the moles of each by the least one of them. The number which is least one of them is 1 and if we divide all of them by 1 then we get 1, 1 and 3 respectively.

So, the mole ratio of Zn:C:O in this compound is 1:1:3 and hence the second choice is correct.

"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."

the increase of protons   hope this