Question

E the given conversion factors below to convert between mass and number of representative par

plecules, and ions)
oblem: How many molecules of methane (CHA) if there are 9.65 gram of methane ?

Answer 1

3.63 x 10²³molecules

Step-by-step explanation:

Given parameters:

Mass of methane = 9.65g

Unknown:

Number of molecules = ?

Solution:

To solve this problem first, we find the number of moles of the given compound or molecule first.

The given molecule is methane;

CH₄;

Number of moles =
`(mass)/(molar mass)`

Molar mass of CH₄ = 12 + 4(1) = 16g/mol

Number of moles =
`(9.65)/(16)` = 0.603moles

So;

From mole concept;

1 mole of a substance contains 6.02 x 10²³ molecules

0.603moles of methane will contain 0.603 x 6.02 x 10²³

= 3.63 x 10²³molecules