Question

The flame of the Bunsen burner is caused by the reaction of methane (CH4) and oxygen...

The flame of the Bunsen burner is caused by the reaction of methane (CH4) and oxygen according to the the following unbalanced equation

CH4 + O2 → CO2 + H2O

If 5.00 g of methane is burned, what mass of water can be produced? Assume the reaction goes to completion.

Homework Answers

Answer #1

The balanced chemical reaction is:

CH4 + 2 O2 —> CO2 + 2 H2O

Molar mass of CH4 = 1*MM(C) + 4*MM(H)

= 1*12.01 + 4*1.008

= 16.042 g/mol

mass of CH4 = 5 g

mol of CH4 = (mass)/(molar mass)

= 5/16.042

= 0.3117 mol

From balanced chemical reaction, we see that

when 1 mol of CH4 reacts, 2 mol of H2O is formed

mol of H2O formed = (2/1)* moles of CH4

= (2/1)*0.3117

= 0.6234 mol

mass of H2O = number of mol * molar mass

= 0.6234*18.016

= 11.2 g

Answer: 11.2 g

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