Question

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

Answer 1

The moles of beryllium  atoms  in 36 g of Be  is 4 moles

 calculation

Moles  of Be  is calculated  mass of Be /molar mass of Be  formula

mas  of Be=36 g

from the  periodic  table the molar mass of Be  is   9 g/mol

moles of Be is therefore = 36 g /9 g/mol  = 4  moles

N.b grams and grams cancel  each other.

Answer 2

$\boxed{{\text{4 moles}}}$of beryllium atoms are present in 36 g of Be.

Further Explanation:

Mole is a measure of the amount of substance. It is defined as the mass of a substance that has the same number of fundamental units as there are atoms in 12 g of carbon-12. Such fundamental units can be atoms, molecules or formula units.

Given information:

The given mass of Be is 36 g.

Calculation of moles of Be:

The number of moles of beryllium is calculated by dividing the given mass of Be by the molar mass of Be. This is expressed in equation (1).

The formula to calculate the moles of Be is as follows:

${\text{Moles of Be}}=\frac{{{\text{Given mass of Be}}}}{{{\text{Molar mass of Be}}}}$             …… (1)

The molar mass of Be is 9.01 g/mol.

Substitute 36 g for the given mass of Be and 9.01 g/mol for the molar mass of Be in equation (1).

$\begin{aligned}{\text{Moles of Be}}&=\left( {{\text{36 g}}} \right)\left( {\frac{{{\text{1 mol}}}}{{{\text{9}}{\text{.01 g}}}}}\right)\\&=3.9{\text{9 mol}}\\&\approx 4\;{\text{mol}}\\\end{aligned}$

Therefore 4 moles of Be is present in 36 g of beryllium.

Learn more:

1. Calculate the moles of chlorine are present in 8 moles of carbon tetrachloride brainly.com/question/3064603

2. Calculate the total number of moles of ions in HCl solution? brainly.com/question/5950133

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Mole concept

Keywords: moles, Be, 9.01 g/mol, 36 g, molar mass, given mass, mole, 12 g, mass of substance, amount of substance, Be, 4 mol, atoms, molecules, formula units, carbon-12, fundamental units.