Question

What is the number of moles of beryllium atoms in 36 g of Be?

Answer 1

Explanation:

Number of moles is the number of particles present in a specific substance.  Therefore, we can calculate number of moles as follows.

    Number of moles = $\frac{mass of substance in grams}{Molar mass of substance}$

Molar mass of Be is 9.0 gram/ mol. Thus, calculate the number of moles of beryllium atoms in 36 g of Be as follows.

           Number of moles = $\frac{mass of substance in grams}{Molar mass of substance}$      

                               = $\frac{36 gram}{9.0 gram/ mol }$

                               = 0.4 mol

Thus, we can conclude that there are 0.4 mol of of beryllium atoms in 36 g of Be.

Answer 2

Answer:

4.0 Mol

Explanation:

I study this same question last year lol and this is the correct answer.