Question

How to calculate valency of an element and write it's formula

How to calculate molecular mass of any substance and write it's formula

Science expert answer this question quickly it's very urgent the answer must be correct i want best answer and answer should short no cheating from internet and answer from ncert book and s Chand book the best answer will be marked as brainliest so expert pls answer quickly it's very urgent

Answer 1

First of all, to know the valency we have to know the atomic number of the element.

From the atomic number, we can find its electronic configuration and then can find its valence electrons.

The valency will be = 8 - (Valence electrons)

To calculate the molecular mass of a substance, we have to multiply the number of atoms of each element by its atomic mass and then adding the total atomic masses of the elements that are combined to form the compound.

For eg,
Water has a formula H2O

So its molecular mass= (2×1) + 16 = 18

Answer 2

to find valency


proton - valence electron

moleculer mass
is just exact like to calculate atomic mass of molecule
for eg

H2O
1.2+16
2+16
18