Answer to Question #179606 in Inorganic Chemistry for Alex

Question

______C2H6  +  ______O2  -->  ______CO2  +  _______H2O

Calculate the mass of carbon dioxide formed when 7.80 g of benzene (C2H6) burns.

Answer 1

C₂H_{6 +} 5O₂ --> 2CO₂ + 6H₂O

Molar mass of benzene = 78 g/mol

Mole benzene = 7.8 g/78 g/mol = 0.1 mol

From balanced equation, 2 moles of benzene burn in O₂ to form 12 moles of CO₂.

Therefore, 0.1 mol of benzene burns in O₂ to form (12/2) x 0.1 = 0.6 mol of CO₂.

Molar mass of CO₂ = 44 g/mol

Hence, mass of CO₂ formed = 0.6 mol x 44 g/mol = 26.4 g