Question

1. calcium nitrate ca(no₃)₂ is often used in fertilizers. which elements are represented in the formula and how many atoms of each element are represented in the formula?

Explanation:

Step1: Identify elements in the formula

The formula for calcium nitrate is $\text{Ca(NO}_3\text{)}_2$. The elements present are Calcium (Ca), Nitrogen (N), and Oxygen (O). So there are 3 elements.

Step2: Calculate number of atoms for each element

• For Calcium (Ca): The coefficient outside the parentheses is 1 (implied), and there's 1 Ca atom inside, so total Ca atoms = $1\times1 = 1$.
• For Nitrogen (N): Inside the parentheses, there's 1 N atom, and the subscript outside the parentheses is 2. So total N atoms = $1\times2 = 2$.
• For Oxygen (O): Inside the parentheses, there are 3 O atoms, and the subscript outside is 2. So total O atoms = $3\times2 = 6$.

Answer:

Elements: Calcium (Ca), Nitrogen (N), Oxygen (O) (3 elements in total).
Number of atoms:

• Calcium (Ca): 1 atom
• Nitrogen (N): 2 atoms
• Oxygen (O): 6 atoms