Question

The molecular weight of glucose C6 H12 O6 is 180.16 g/mol. How many moles of glucose are in 19.1 grams of glucose?

a) 0.1 mol
b) 0.2 mol
c) 0.3 mol
d) 0.4 mol

Answer 1

To find the moles of glucose in 19.1 grams, divide the mass by the molar mass of glucose (180.16 g/mol). The result is approximately 0.1 mol, which is answer choice (a).

Step-by-step explanation:

The question asked is focused on determining the number of moles of glucose present in a given mass of glucose. To find out the number of moles, we need to use the formula:

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

From the question we know that:

• The mass of glucose is 19.1 grams.
• The molar mass of glucose, C6H12O6, is 180.16 g/mol.

Applying the formula:

Number of moles = 19.1 g / 180.16 g/mol = 0.106 mol

The number of moles is approximately 0.1 mol, which corresponds to answer choice (a).

This calculation is a common task in chemistry, involving the concept of molar mass and the conversion between grams and moles. It's important to remember that the molar mass is a conversion factor relating the mass of a substance to the amount in moles, enabling us to use the balanced chemical equations and to connect with concepts such as Avogadro's number.