Question

Of each of these equations, determine the change in the number of moles (change in n gas)


(a) (NH4)2CO3(s) yields 2NH3 (g) + CO2 (g) + H2O (g) ___________ mol

(b) H2 (g) + Cl2 (g) yields @HCl (g) ___________ mol

(c) 2H2 (g) + O2 (g) yields 2H2O (l) ___________ mol

(d) 2Na (s) + Cl2 (g) yields 2NaCl (s) ___________ mol

Answer 1

Concepts and reason

A mole represents the amount of chemical substances present in the system.

In a balanced chemical equation, number of atoms on the reactant side will be equal to number of atoms on the product. Based on the balanced chemical equation, the amount of species that have participated in the chemical reaction and the amount of product formed can be determined.

Fundamentals

For a balanced chemical equation,

(a)

The given reaction was written as follows,

The number of atoms on the reactant side is equal to the number of atoms on the product side, therefore the given reaction is balanced. In the above reaction one mole of reactant in the solid state produces four mole of gaseous product

(b)

Write the given reaction,

Balance the above reaction:

(c)

The given reaction,

The given reaction is in balanced form

In the above reaction two moles of hydrogen in gas state react with one mole of oxygen in gas state to produce two moles of water in liquid form. Change in number of moles of gas during the reaction was calculated as .

(d)

The given reaction is

The given reaction is in balanced form

In the above reaction two moles of sodium in solid state react with one mole of chlorine in gas state to produce two moles of sodium chloride in solid state. Change in number of moles of gas during the reaction was calculated as.

Ans: Part a

The change in the moles of gas is

Part b

The change in the moles of gas is

Part c

The change in the moles of gas is

Part d

The change in the moles of gas is