Algonquin College Health Program Assessment (AC-HPAT) Practice Exam

How many grams are equivalent to one mole of boron?

1. 10.81 g

2. 12.01 g

3. 14.01 g

4. 7.02 g

The correct answer is: 10.81 g

One mole of an element is defined as the amount of that element that contains the same number of entities (atoms, molecules, etc.) as there are in 12 grams of carbon-12. The mass of one mole of any substance is numerically equal to its atomic or molecular weight expressed in grams. Boron has an atomic weight of approximately 10.81 g/mol. This means that one mole of boron weighs 10.81 grams. The atomic weight of boron is derived from its isotopic composition and reflects the average mass of its naturally occurring isotopes. Therefore, when you are asking how many grams correspond to one mole of boron, the appropriate answer is 10.81 grams, which aligns with the actual atomic weight of boron. This understanding is essential in chemistry, especially when performing stoichiometric calculations or preparing solutions, as it allows one to accurately measure the amount of a substance based on its molarity and volume.