1. Explain: what is the purpose of balancing a chemical equation?

2 answers:

6 0

The purpose of balancing a chemical equation is to get the correct proportions of reagents and products for a reaction.

How to balance the Chemical Equation:
Step 1: count the number of atoms on each side of the equation
Step 2: Look at coefficients (the number In front of the element) and balance the equation
Step 3: ONLY CHANGE COEFFICIENTS
Step 4: Count polyatomic ions as one item

labwork [276]2 years ago

5 0

Answer for 1: The purpose of balancing a chemical equation is to obtain the correct products for a given reaction

Answer for 2:
Step 1: Write the unbalanced chemical equation

Step 2: Write down the number of atoms

Step 3: Add coefficients to balance mass in a chemical equation

Step 4: balance oxygen and hydrogen atoms

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How many total atoms are in 0.290 g of P2O5?

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There are 8.61 × 10²⁰ atoms in 0.290 g P₂O₅.

Step 1. Convert grams of P₂O₅ to moles of P₂O₅.

$\text{Moles of P}_{2}\text{O}_{5} = \text{0.290 g } \text{P}_{2}\text{O}_{5} \times \frac{\text{1 mol }\text{P}_{2}\text{O}_{5}}{\text{141.94 g }\text{P}_{2}\text{O}_{5}} = \text{0.002 043 mol } \text{P}_{2}\text{O}_{5} \\$

Step 2. Convert moles of P₂O₅ to molecules of P₂O₅.

$\text{Molecules of } \text{P}_{2}\text{O}_{5} = \text{0.002 043 mol } \text{P}_{2}\text{O}_{5} \times \frac{6.022 \times 10^{23}\text{ molecules }\text{P}_{2}\text{O}_{5}}{\text{1 mol } \text{P}_{2}\text{O}_{5}}\\$

$= 1.23 \times10^{21}\text{ molecules } \text{P}_{2}\text{O}_{5}\\$

Step 3. Convert molecules of P₂O₅ to atoms.

There are seven atoms in 1 mol P₂O₅.

∴ $\text{Total atoms} = 1.23\times 10^{21 }\text{ molecules }\text{P}_{2}\text{O}_{5} \times\frac{\text{7 atoms}}{\text{1 molecule }\text{P}_{2}\text{O}_{5}} = 8.61 \times 10^{21}\text{ atoms}\\$