Question

In the combustion reaction 2C2H6 + 702 → 4C02 + 6H20, ethane gas reacts with oxygen to

produce carbon dioxide and steam. If 18.6 grams of C2H6 reacts with O2, how many moles of
steam does it produce?

Answer 1

1.86moles

Step-by-step explanation:

Given chemical reaction:

2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O

Mass of C₂H₆ = 18.6g

Unknown:

Number of moles of steam produced = ?

Solution:

2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O

We have checked and the equation is balanced.

Now, find the number of moles of C₂H₆ from the given mass;

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

Molar mass of C₂H₆ = 2(12) + 6(1) = 30g/mol

Number of moles =
`(18.6)/(30)` = 0.62moles

From the balanced reaction equation:

2 mole of C₂H₆ will produce 6 moles of steam

0.62 moles of C₂H₆ will therefore produce
`(0.62 x 6)/(2)` = 1.86moles