Question

If methane undergo combustion, what mass of methane must be burnt to produce 27.5 g of CO2?

Answer 1

Answer:

Mass of methane burnet 10.025 g.

Explanation:

Given data:

Mass of CO₂ produced = 27.5 g

Mass of methane burnet = ?

Solution:

Balanced  chemical equation.

CH₄ + 2O₂    →   CO₂ + 2H₂O

First of all we will calculate the number of moles of CO₂ produced.

Number of moles = mass/ molar mass

Number of moles = 27.5 g/ 44 g/mol

Number of moles = 0.625 mol

Now we will compare the moles of CO₂ with CH₄.

                      CO₂            :              CH₄

                        1               :                 1

                     0.625         :               0.625

0.625 moles of CH₄ are burnet.

Mass of methane burned:

Mass = number of moles × molar mass

Mass = 0.625 mol × 16.04 g/mol

Mass = 10.025 g