Question

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

Answer 1

Step-by-step 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 =
`(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 =
`(mass of substance in grams)/(Molar mass of substance)`

=
`(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.