Question

Balance the following reaction:

C5H8 + _____ O2 ________ CO2. + _______ H2O

How much heat (q) will be released by water, H2O, if 34 grams of C5H8 reacts? Hint: This is a stoichiometry problem, before it’s a thermochemistry problem.

Answer 1

• C_5H_8+13/2O_2—»5CO_2+4H_2O

Balanced one

• 2C_5H_8+13O_2—»10CO_2+8H_2O

Moles of Pentyne

• Given mass/Molarmass
• 34/68
• 0.5mol

Moles of H_2O

• 8/2(0.5)
• 4(0.5)
• 2mol

1mol releases 241.8KJ

2mol releases 241.8(2)=483.6KJ