Question

calculate the molecular masses of 02,Cl2,CO2
​

Answer 1

Explanation:

02 - 16×2=32

Cl2 - 35.5×2 = 71

CO2 - 12×1 + 16×2 = 44

Answer 2

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${\underbrace{\underline{UNDERSTANDING \: \: CONCEPT}}}</p><p></p><p>$

molecular mass is obtained by multiplting the atomic mass of an element with the number of atoms in the molecule and then adding the masses of all the elements in the molecule.

⑅ TO FIND:-

• MOLECULAR MASS OF O2, Cl2, CO2.

⑅ FORMULA USED:-

• Atomic mass × number of atoms

◑ LET'S START:-

FOR O2 --

O2 is a diatomic molecule,

The mass of oxygen atom is 16 amu.

Number of atoms = 2.

∴ Molecular mass of O2 = 2 × 16

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: :\longrightarrow{\boxed{\purple{32 amu}}}$

For Cl2 --

The mass of chlorine atom = 35.5 amu.

Number of atoms = 2.

∴ Molecular mass of Cl2 = 35.5 × 2

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: :\longrightarrow{\boxed{\purple{70.9 amu}}}$

For CO2 --

In this, we will first find the mass of one molecule of carbondioxide by adding together the masses of 1 atom of carbon and 2 atoms of oxygen.

The mass of carbon atom = 12 amu.

Number of carbon atoms = 1.

The mass of oxygen atom = 16 amu.

Number of oxygen atoms = 2.

∴ Molecular mass of CO2 = 12 × 1 + 16 × 2

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: :\longrightarrow{\boxed{\purple{44.01 amu}}}$

HOPE IT HELPS