Calculate the number of moles in a 233-gram sample of barium. A) 0.589 moles B) 1.70 moles C) 3.20 × 10⁴ D) 6.022 × 10²³ moles E) 1.02 × 10²⁴ moles

Question

Quizplus · Accepted Answer

To calculate the number of moles, we need to divide the mass of the sample by the molar mass of the substance. The molar mass of barium is 137.33 g/mol.

Moles = Mass/Molar mass 
Moles = 233 g / 137.33 g/mol 
Moles = 1.695

Rounded to two significant figures, the answer is 1.70 moles, which is choice B.

Calculate the Number of Moles in a 233-Gram Sample of Barium