Question

1 ton of TNT can produce 4.6 x 109 J of energy. A chemist wants to know how to obtain this much energy from acetylene (C2H2) and Oxygen (O2). How much acetylene and Oxygen would be required? Provide the name and structure of the "TNT". Reaction between Acetylene and Oxygen: ΔH= -2510 KJ

Answer 1

The reaction is

C2H2 + 5/2 O2 -----------> 2CO2 + H2O delta H = -2510kJ

That is

one moles of C2H2 = 26g/mol reacts with 5/2 moles of O2 = 80 g of O2 to give 2510x10³ J of energy.

how much C2 H2 is required to give 4.6x 10⁹ J of energy

mass of C2H2 = 26g x 4.6 x 10⁹ J/ 2510x 10³ J

= 4.765 x10⁴ g

= 47.65x10³ g

= 47.65 kg of acetylene

mass of O2 required

26g of acetylene needs 80 g of oxygen

4.7657 x10⁴ g of C2H2 needs = 4.765 x10⁴ g x 80 g/ 26g

= 14.66 x 10⁴

= 146.5 kg of O2

Thus the amounts of C2 H2 and O2 required are 47.65 kg and 146.5 kg respectively.