Question

calculate the mass of one molecule of sulphur dioxide

Answer 1

We know Avogadro number of SO₂ molecules weigh 64 grams.

6.023 x 10²³ molecules of SO₂ weigh 64 grams.

Calculating we get,
1molecule of SO₂ will weigh → 1.062 x 10⁻²² grams

Answer 2

Concept:

Avogadro's number (6.022 x 10²³) of molecules or formula units make up one mole of a substance. The mass of 1 mole of a chemical and the number of grams per mole are determined by the compound's molar mass. The entire mass of all the atoms that make up a mole of a certain molecule, expressed in grams, is known as molar mass.

Given:

1 molecule of sulfur dioxide.

Find:

Calculate the mass of one molecule of sulfur dioxide.

Solution:

We know that,

The mass of a molecule can be calculated as:

Mass = number of moles * Molar mass

The molar mass of sulfur dioxide (SO₂) =  64 g/mol

Therefore, the number of molecules can be calculated as.

1 mol of SO₂ is 64 g = 64 * 10⁻³ Kg

1 mole of a substance contains 6.022 * 10²³ molecules.

The mass of 1 molecule of SO₂ = 64 * 10⁻³ Kg / 6.022 * 10²³  = 10.62241 * 10⁻²⁰ Kg = 10.62 * 10⁻²⁰ Kg

Hence, the mass of one molecule of sulfur dioxide is 10.62 * 10⁻²⁰ Kg.

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