Question

water chemical reaction
hydrogen gas (h₂) oxygen gas (o₂) water (h₂o)
which of the following statements describes how mass was conserved in this chemical reaction?
a there are two reactant molecules and three product molecules.
b there are three reactant molecules and two product molecules.
c the reactants have four hydrogen atoms and two oxygen atoms, and the products have the same atoms in two molecules of h
d the products have four hydrogen atoms and two oxygen atoms, and the reactants have the same atoms in two molecules of h

Explanation:

Step1: Analyze the number of reactant molecules

There are 2 \(H_2\) molecules and 1 \(O_2\) molecule. So, the total number of reactant molecules is \(2 + 1=3\).

Step2: Analyze the number of product molecules

There are 2 \(H_2O\) molecules.

Step3: Analyze the number of atoms

For hydrogen: In reactants, \(2\) \(H_2\) molecules have \(2\times2 = 4\) \(H\) atoms. In products, \(2\) \(H_2O\) molecules have \(2\times2=4\) \(H\) atoms.
For oxygen: In reactants, \(1\) \(O_2\) molecule has \(2\) \(O\) atoms. In products, \(2\) \(H_2O\) molecules have \(2\times1 = 2\) \(O\) atoms.

Answer:

C. The reactants have four hydrogen atoms and two oxygen atoms, and the products have the same atoms in two molecules of \(H_2O\)