Which of the following steps is necessary to convert moles of a substance to grams?

• A. Multiply the number of moles by the molar mass of the substance.
• B. Divide the number of moles by Avogadro's number.
• C. Divide the number of moles by the molar mass of the substance.
• D. Multiply the number of moles by Avogadro's number.

Answer: (A)

Verified step by step guidance

1. Understand the concept of molar mass: Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). It is a crucial factor in converting moles to grams.
2. Identify the molar mass of the substance: Look up the molar mass of the substance in a periodic table or a chemical database. This value is essential for the conversion process.
3. Set up the conversion equation: To convert moles to grams, use the equation: \( \text{grams} = \text{moles} \times \text{molar mass} \). This equation shows that you multiply the number of moles by the molar mass.
4. Perform the multiplication: Multiply the number of moles of the substance by its molar mass. This calculation will give you the mass of the substance in grams.
5. Check your units: Ensure that the units are consistent and correctly cancel out, leaving you with grams. This step verifies that the conversion was done correctly.