Question

If you pump 40.088g of octane (C8H18) into your gas tank, how mant molecules of octane are you pumping

Answer 1

Answer:

2.11 × 10²³ molecules of octane

Explanation:

Given data:

Mass of octane = 40.088 g

Molecules of octane = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen

Number of moles of octane:

Number of moles = mass/ molar mass

Number of moles = 40.088 g / 114.23 g/mol

Number of moles =  0.351 mol

Number of molecules:

one mole of octane = 6.022 × 10²³ molecules of octane

0.351 mole of octane = 0.351 ×  6.022 × 10²³ molecules of octane

2.11 × 10²³ molecules of octane

Answer 2

2.11 x 10²³molecules

Explanation:

Given parameters:

Mass of octane = 40.088g

Unknown:

Number of molecules of the octane = ?

Solution:

To find the number of molecules of the octane. We need to first convert the given mass of octane to number of moles.

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

Molar mass of octane = (8 x 12)  + (1 x 18) = 114g/mol

 Number of moles = $\frac{40.088}{114}$ = 0.35moles

1 mole of a substance contains  6.02 x 10²³ molecules

0.35 moles will contain 0.35 x 6.02 x 10²³ = 2.11 x 10²³molecules

Learn more:

Number of molecules brainly.com/question/10818009

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