Final answer:
To find the mass of 6.022 x 10²³ molecules of CO₂, use Avogadro's number and the molar mass of CO₂, which is 44.009 g/mol. Therefore, the mass of 6.022 x 10²³ CO₂ molecules is 44.009 grams.
Step-by-step explanation:
The student's question, 'What is the mass in grams of 6.022 x 10²³ molecules of CO₂?', can be answered by using Avogadro's number and the molar mass of carbon dioxide (CO₂). Avogadro's number is 6.022 x 10²³ molecules per mole, which is a constant used to convert between the number of particles and the amount of substance in moles.
To find the mass, first establish the molar mass of CO₂. By adding the atomic masses, the molar mass of CO₂ is 1x12.011 g/mol for carbon (C) and 2x15.999 g/mol for oxygen (O), totaling 44.009 g/mol. Given that 1 mole of CO₂ has a mass of 44.009 grams and that 6.022 x 10²³ molecules represents 1 mole, the mass of 6.022 x 10²³ molecules of CO₂ is 44.009 grams.