What’s the coefficient in 4Ca(OH)2 ?
The Correct Answer and Explanation is :
In the formula (4 \text{Ca(OH)}_2), the coefficient is 4.
Explanation:
In chemical notation, a coefficient is the number written in front of a compound or element’s formula, indicating the quantity of molecules or formula units involved in a reaction or process. In (4 \text{Ca(OH)}_2), the “4” in front is the coefficient. It signifies that there are four units of calcium hydroxide, (\text{Ca(OH)}_2).
Let’s break down this further:
- What the Coefficient Does: The coefficient tells us how many molecules (or moles) of that compound are present. Here, (4 \text{Ca(OH)}_2) means there are four molecules (or moles, in the context of larger quantities) of calcium hydroxide. Each molecule of (\text{Ca(OH)}_2) consists of one calcium (Ca) atom, two oxygen (O) atoms, and two hydrogen (H) atoms.
- Expanding the Formula: If we consider (4 \text{Ca(OH)}_2) at the atomic level, the coefficient “4” applies to the entire (\text{Ca(OH)}_2) unit. Therefore:
- Calcium atoms: (4 \times 1 = 4) Ca atoms
- Oxygen atoms: (4 \times 2 = 8) O atoms
- Hydrogen atoms: (4 \times 2 = 8) H atoms
- Usage in Chemical Equations: Coefficients are critical in balancing chemical reactions. They help maintain the law of conservation of mass, ensuring the same number of each atom on both sides of a reaction. By adjusting coefficients, chemists can balance the equation, making sure it correctly represents what happens in the reaction.
In summary, the coefficient in (4 \text{Ca(OH)}_2) is 4, and it indicates the presence of four separate (\text{Ca(OH)}_2) molecules or moles, impacting the total number of each atom present in a reaction or compound.