Question

ethene ($c_2h_4$) is used in welding and metal cutting. ethene burns in oxygen gas ($o_2$) to produce carbon dioxide ($co_2$) and water vapor ($h_2o$). this chemical reaction is represented by the model below.determine the number of each type of atom in the reactants and products.| | number of atoms in reactants | number of atoms in products || ---- | ---- | ---- || h | 4 | 4 || c | | || o | | |

Explanation:

Step1: Count C atoms in reactants

From $\text{C}_2\text{H}_4$, number of C atoms = 2

Step2: Count O atoms in reactants

From 3 $\text{O}_2$ molecules: $3 \times 2 = 6$

Step3: Count C atoms in products

From 2 $\text{CO}_2$ molecules: $2 \times 1 = 2$

Step4: Count O atoms in products

From 2 $\text{CO}_2$: $2 \times 2 = 4$; from 2 $\text{H}_2\text{O}$: $2 \times 1 = 2$; total = $4+2=6$

Answer:

	Number of atoms in reactants	Number of atoms in products
C	2	2
O	6	6