Question

The mass of one mole of sugar is 342g. If you used 19g of sugar, what is the number of moles of sugar you used?

A) 0.055 moles
B) 0.056 moles
C) 0.057 moles
D) 0.058 moles

Answer 1

The number of moles of sugar when using 19g of sugar with a molar mass of 342g/mol is calculated by dividing the mass by the molar mass, resulting in approximately 0.056 moles (Option B).

The correct answer is B.

Step-by-step explanation:

The question concerns how to calculate the number of moles of sugar used if you start with 19g of sugar, knowing that the molar mass of sugar is 342g/mol.

To find the number of moles, you use the formula:

Number of moles = Mass of substance (g) / Molar mass (g/mol)

Number of moles = 19g / 342g/mol

Performing this calculation:

Number of moles = 0.0555555556 moles

When rounded to two decimal places as per the given options, this value is approximately 0.056 moles, which corresponds to option B.