Question

A sample of the sugar D-ribose of mass 0.727 grams contains approximately how many moles of D-ribose?

a) 4.04 x 10^-3 moles
b) 2.22 x 10^-2 moles
c) 4.28 x 10^-3 moles

Answer 1

The sample of D-ribose contains approximately 0.00484 moles.

Step-by-step explanation:

To determine the number of moles of D-ribose, we need to use the formula: moles = mass / molar mass. The molar mass of D-ribose is 150.13 g/mol.

Using the given mass of 0.727 grams, we can calculate the number of moles:

moles = 0.727 g / 150.13 g/mol = 0.00484 moles

Therefore, the sample of D-ribose contains approximately 0.00484 moles of D-ribose.