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

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.

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:

            …… (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).

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

2. Calculate the total number of moles of ions in HCl solution?

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.

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.