Answer: The mass of 1 mole of boron is 10.811 grams.
Step-by-step explanation:
To calculate the number of moles, we use the equation:

We are given:
Moles of boron = 1 mole
Molar mass of boron = 10.811 g/mol
Putting values in above equation, we get:

Hence, the mass of 1 mole of boron is 10.811 grams.