Question

What is the equation when C2 H2 gas burns in oxygen to form carbon dioxide and water along with evolution of heat

Answer 1

Word Equation :

$\sf C_2 H_2$ burns in presence of Oxygen to form Water and evolve Carbondioxide and Heat .

The above reaction is an example of Combustion

The reaction can be represented as :

$\sf C_2H_2 + O_2 \longrightarrow CO_2 + H_2O + Heat$

We notice that the above equation is Unbalanced.

Reactants :

$\begin{array}{| c | c |}\cline{1-2}\sf Element & \sf No.of \ Atoms \\ \cline{1-2}\sf C & \sf 2 \\ \cline{1-2}\sf H & \sf 2 \\ \cline{1-2}\sf O & \sf 2 \end{array}$

Products :

$\begin{array}{| c | c |}\cline{1-2}\sf Element & \sf No.of \ Atoms \\ \cline{1-2}\sf C & \sf 1 \\ \cline{1-2}\sf H & \sf 2 \\ \cline{1-2}\sf O & \sf 3 \end{array}$

Let's start by balancing the Carbon Atoms.

• Since,there are two atoms of Carbon on the Reactants Side and one atom of Carbon on the products side.

Multiplying $\sf CO_2$ by 2,the reaction becomes :

$\sf C_2H_2 + O_2 \longrightarrow 2CO_2 + H_2O + Heat$

Now,

• There are 5 atoms of Oxygen on products side and 2 atoms of Oxygen.

Multiplying the Oxygen Atoms on Reactant Side by 5/2,

$\sf C_2H_2 + \dfrac{5}{2}O_2 \longrightarrow 2CO_2 + H_2O + Heat$

• Generally, Stoichiometric Coefficients are represented in Whole Numbers.

Multiplying both sides of the equation by 2,

$\sf 2C_2H_2 + 5O_2 \longrightarrow 4CO_2 + 2H_2O + Heat$

Answer 2

Answer:

Equation of combustion of ethyne (C2H2) in presence of Oxygen.

The reactants are :

• Ethyne ( C2H2)
• Oxygen (O2)

The products are :

• Carbon dioxide ( CO2)
• Water ( H20)
• Heat (∆)

The equation stands as follows :

$C_{2}H_{2} + O_{2} \rightarrow CO_{2} + H_{2}O + \Delta$

The basic trick for balancing this type of Equation is that :

• First balance the Carbon atoms on both sides
• Then balance the Hydrogen atoms
• Finally balance the Oxygen atoms.

Balanced equation :

$C_{2}H_{2} + \dfrac{5}{2}O_{2} \rightarrow 2CO_{2} + H_{2}O + \Delta$

This can be rounded off as follows:

$\boxed{\red{\bold{2C_{2}H_{2} + 5O_{2} \rightarrow 4CO_{2} + 2H_{2}O + \Delta}}}$