Which of the following equations is balanced correctly?
A. 3 H20 = H2 + 3 O2
B.2 C2H2 + 5 O2 = 4 CO2 + 2 H2O
C.Cl2 + 2 KBr = KCI + Br2
D. 2 C3H3 + O2 = 2 CO2 + H2O
To determine which of the following equations is balanced correctly, we need to understand the concept of balancing chemical equations. Balancing an equation involves ensuring that there is an equal number of each type of atom on both sides of the equation.
Let's go through each option and check if it is balanced:
A. 3 H2O = H2 + 3 O2
To balance this equation, we need to ensure that the same number of atoms of each element appears on both sides. However, in this equation, the hydrogen (H) and oxygen (O) atoms are not balanced. There are three hydrogen atoms on the left side, but only two on the right side. Similarly, there are three oxygen atoms on the right side, but only one on the left side. Thus, option A is not balanced.
B. 2 C2H2 + 5 O2 = 4 CO2 + 2 H2O
To determine if this equation is balanced, we need to count the number of atoms of each element. On both sides of the equation, there are two carbon (C) atoms, four hydrogen (H) atoms, and ten oxygen (O) atoms. Therefore, option B is balanced.
C. Cl2 + 2 KBr = KCl + Br2
To check if this equation is balanced, we count the number of atoms of each element. On both sides, there is an equal number of chlorine (Cl) and bromine (Br) atoms. There are also two potassium (K) atoms and two bromine (Br) atoms on both sides. Hence, option C is balanced.
D. 2 C3H3 + O2 = 2 CO2 + H2O
To verify whether this equation is balanced, we count the number of atoms of each element. Both sides of the equation have six carbon (C) atoms, six hydrogen (H) atoms, and two oxygen (O) atoms. As a result, option D is balanced.
Therefore, the correct answer is option B: 2 C2H2 + 5 O2 = 4 CO2 + 2 H2O.