Question

what is the value of (delta) ng for the following reaction :- H2(g) + I2(g) -- 2HI(g)

Answer 1

delta ng value is equal to product gaseous molecule-reactant gaseous molecule
(2-1-1)=0

Answer 2

Answer:  $\Delta n_g$=0

Explanation:

For the given balanced chemical reaction;

$H_2(g)+I_2(g)\rightarrow 2HI(g)$

Reactants of a chemical reaction is defined as the substances which take part in a chemical reaction and undergoes a chemical change. Reactants are written on left side of the arrow.

Products are defined as the substance which are formed at the end of the chemical reaction.Products are written on the right side of the arrow.

$\Delta n_g$= number of moles of gaseous products - number of moles of gaseous reactants.

Number of moles of reactants =  1 mole of $H_2$ gas+ 1 mole of $I_2$ gas

Number of moles of products =  2 moles of $HI$ gas

Thus  $\Delta n_g$= number of moles of gaseous products - number of moles of gaseous reactants= 2-2= 0