Question

Calculate the number of molecules in 11 g of CO₂

Answer 1

To find the number of CO₂ molecules in 11 g, convert the mass to moles using the molar mass of CO₂, then multiply by Avogadro's number, resulting in approximately 1.505 × 10²³ molecules.

Step-by-step explanation:

To calculate the number of molecules in 11 g of CO₂, we first need to determine how many moles of CO₂ we have. Using the molar mass of CO₂, which is 44.009 g/mol, we can convert grams of CO₂ to moles.

Then, we use Avogadro's number to convert moles to molecules.

The calculation is as follows:

1. First, divide the mass of CO₂ by its molar mass: 11 g CO₂ ÷ 44.009 g CO₂/mol = 0.2499 moles of CO₂.
2. Then, multiply the moles of CO₂ by Avogadro's number (6.022 × 10²³ molecules/mol) to find the number of molecules: 0.2499 moles × 6.022 × 10²³ molecules/mol = approximately 1.505 × 10²³ molecules of CO₂.