Which of the following tasks most likely involves a calculation that uses moles?

• A. Recording the mass of a beaker
• B. Determining the number of atoms in 12 g of carbon
• C. Measuring the temperature of a solution
• D. Observing the color change in a chemical reaction

Answer: (B)

Verified step by step guidance

1. Understand the concept of a mole: A mole is a unit in chemistry used to count particles such as atoms, molecules, or ions. It relates the mass of a substance to the number of particles it contains.
2. Identify which tasks involve counting particles or relating mass to number of particles. Recording the mass of a beaker and measuring temperature do not involve counting particles or using moles.
3. Recognize that determining the number of atoms in 12 g of carbon requires converting mass to moles, then using Avogadro's number to find the number of atoms.
4. Observing a color change is a qualitative observation and does not involve mole calculations.
5. Therefore, the task that most likely involves a calculation using moles is determining the number of atoms in 12 g of carbon, because it requires converting grams to moles and then to number of atoms.