What is the formula mass of beryllium chloride , becl2?

1 answer:

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To determine the formula mass of beryllium chloride, BeCl₂, we start up with the basis of one mole first.

Basis: 1 mole BeCl₂
To determine the molar mass of BeCl₂, we add up the mass of one mole of beryllium and two moles of chlorine.

1 mol Be = 9 g/mol
1 mol of Cl = 35.45 g/mol

Solving,
molar mass of BeCl₂ = (1 mol Be)(9 g/mol) + (2 mols Cl)(35.45 g/mol)
molar mass of BeCl₂ = 79.9 g

Then, we take into consideration that 1 mol is equal to 6.022 x 10²³ formula units.
formula mass BeCl₂ = (79.9 g/mol)(1 mol/6.022 x 10²³ formula units)
formula mass of BeCl₂ = 1.33 x 10⁻²² g/formula unit

Answer: 1.33 x 10⁻²² g/formula unit

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Answer:

Explanation:

To solve this problem, we must understand the relationship between mass of a substance and the number of atoms.

Atoms are the smallest indivisible particles of any matter. A substance can be made up of several number of atoms in their space.

The mass of any substance is a function of the amount of atoms its contains.

The mass of a substance is related in chemistry to the amount of atoms its contains using the parameter called the number of moles.

A mole is the amount of substance that contains the Avogadro's number of particles. This number is 6.02 x 10²³ particles. The particles here can be protons, neutrons, electrons, atoms e.t.c.

Now,

Number of moles = $\frac{mass}{molar mass}$