Question

How many boron atoms are there in 2.00 g of boron

Answer 1

the atomic mass for boron is 10.8
therefore 2.0 g of boron is 2.0 [g] / 10.8 [g/mol] 0.185 mol 
hope this helped

Answer 2

Answer:- $1.11*10^2^3$ atoms of boron.

Solution:- It's unit conversion problem that could easily be solved step by step.

Step 1:- grams to moles conversion-

2.00 g B (1 mol B/10.81 g B) = 0.185 mol B

Step 2:- mol to atom conversion-

0.185 mol B(6.022 x 10^23 atom B/1mol B) = $1.11*10^2^3$ atoms of B