Question

Mehtyl alcohol is called wood spirit. Its molecular formula is CH3OH. Calculate the number of moles that would contain 2.5*10^21 molecules of this compound.

Answer 1

The 2.5 x 10²¹ molecules of CH₃OH have 0.00415 moles.

What is the mole concept?

• The Mole concept is used to express the amount of substance conveniently.

• A mole is defined as the amount of substance that contains exactly 6.022 x 10²³ elementary particles of the given substance. Here, elementary particles refer to atoms, molecules, or ions.
• This fixed number  6.022 x 10²³ is known as Avogadro Number and is denoted by $N_A$

How to calculate the number of moles?

The number of moles is given by

$n=\frac{m}{M}$

When given mass = molar mass of a substance, then no of moles is equal to 1 which is equivalent to 6.022 x 10²³.

We also know,

1 mole has 6.022 x 10²³ molecules of CH₃OH

According to the mole concept,

6.022 x 10²³ molecules of CH₃OH is equal to 1 mole

2.5 x 10²¹molecules of CH₃OH is equal to $\frac{2.5\times10^2^1}{6.022 \times 10^2^3}$ moles

Thus, 2.5 x 10²¹molecules of CH₃OH are equal to 4.15 x 10⁻³ moles or 0.00415 moles

Learn more about the mole concept:

brainly.com/question/1427235

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