Question

Hexane burns in air to form carbon dioxide and water. The oxygen is store at 40.0 Celsius and at a pressure of 106.6kPa. How many moles of oxygen will react with 500. Grams of hexane

Answer 1

Answer: 55.233 moles of oxygen will react with 500 g of hexane.

Step-by-step explanation:

To calculate the number of moles, we use the equation:

`\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}`

Given mass of hexane = 500g

Molar mass of hexane = 86 g/mol

Putting values in above equation, we get:

`\text{Moles of hexane}=(500g)/(86g/mol)\\\\\text{Moles of hexane}=5.814mol`

The chemical equation for the reaction of burning of hexane in air follows:

`2C_6H_(14)+19O_2\rightarrow 12CO_2+14H_2O`

By stoichiometry of the reaction:

2 moles of hexane reacts with 19 moles of oxygen

So, 5.814 moles of hexane will react with =
`(19)/(2)* 5.814=55.233moles` of oxygen

Hence, 55.233 moles of oxygen will react with 500 g of hexane.