Question

(04.01 mc)
a chemical equation is shown:
c₂h₄ + o₂ → co₂ + h₂o
according to the law of conservation of mass, how many atoms of oxygen exist in the products of this reaction?
○ a 2
○ b 4
○ c 6
○ d 8

Explanation:

Step1: Balance the chemical equation

$$\mathrm{C}_{2} \mathrm{H}_{4}+3 \mathrm{O}_{2} ightarrow 2 \mathrm{CO}_{2}+2 \mathrm{H}_{2} \mathrm{O}$$

Step2: Calculate the number of oxygen atoms in the products

In \(2\mathrm{CO}_{2}\), the number of oxygen atoms is \(2\times2 = 4\). In \(2\mathrm{H}_{2}\mathrm{O}\), the number of oxygen atoms is \(2\times1=2\). So the total number of oxygen atoms in the products is \(4 + 2=6\).

Answer:

C. 6