How many molecules are in 385 grams of CO2?

How many molecules are in 385 grams of CO2?

A. 5.62 x 10^23 molecules

B. 8.75 x 10^23 molecules

C. 1.24 x 10^24 molecules

D. 2.18 x 10^24 molecules

Answer:

B. 8.75 x 10^23 molecules

To calculate the number of molecules in 385 grams of CO2, we first need to determine the molar mass of CO2. The molar mass of CO2 (carbon dioxide) is approximately 44.01 g/mol. We can then use this information to convert grams to molecules using Avogadro's number.

First, calculate the number of moles of CO2 in 385 grams:

385 grams CO2 x (1 mol CO2 / 44.01 grams CO2) = 8.75 moles CO2

Next, use Avogadro's number (6.022 x 10^23 molecules/mol) to convert moles to molecules:

8.75 moles CO2 x (6.022 x 10^23 molecules/mol) = 5.27 x 10^24 molecules CO2

Therefore, there are approximately 8.75 x 10^23 molecules in 385 grams of CO2.

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