Question

Write chemical formulas for compounds containing each of the following. One nitrogen atom for every three chlorine atoms.

Answer 1

Answer:

NCL3

Explanation:

NCL3

- nitrogen trichloride.

Answer 2

Answer:

The number goes as the subscript of the atoms in the chemical formula.

So

$N_1 Cl_3$  is the chemical formula.

Please Note: To find the number of atoms of each element present  

For example $5 Ca_1 Cl_2$ contains  

5 × 1 = 5 ,Ca atoms and

5 × 2 = 10, Cl atoms  

If there is a bracket in the chemical formula  

For example $3Ca_3 (P_1 O_4 )_2$ we multiply coefficient × subscript × number outside the bracket.......... to find the number of atoms  (Please note: 3 is the coefficient, and if there is no number given then 1 will be the coefficient )

So

3 × 3 = 9 , Ca atoms  

3 × 1 × 2 = 6, P atoms  

3 × 4 × 2 = 24, O atoms are present.