Question

One sucrose molecule weighs in grams? Express your answer with the appropriate units.

A) 342 g/mol
B) 180 g/mol
C) 50 g/mol
D) 22 g/mol

Answer 1

One molecule of sucrose cannot be directly measured in grams because it is extremely small. The molar mass of sucrose is 342.297 g/mol and is the mass of one mole of sucrose, which contains Avogadro's number of molecules.

Step-by-step explanation:

To determine how many grams one molecule of sucrose weighs, we first need to clarify that individual molecules are incredibly small and their masses are typically not measured in grams. Instead, we use the unit of molar mass, which is the mass of one mole of a substance. One mole contains Avogadro's number (6.022 × 1023) of molecules. The molar mass of sucrose (C12H22O11) is 342.297 g/mol, as given in the question.

The correct answer to how much one sucrose molecule weighs is not directly expressed in grams because of how small it is. To estimate the weight of a single molecule in grams, you would take the molar mass and divide it by Avogadro's number.

However, looking at the choices provided in the question, A) 342 g/mol is the molar mass of sucrose. The other options (B, C, and D) are not the correct molar mass for sucrose.