Question

A student uses a piece of nichrome wire to ignite the naphthalene in the bomb. The nichrome wire initially weighed 0.0193 g. After the carrying out performing a bomb calorimetry measurement, the unburned nichrome weighed 0.0045 g. How much heat was released in the run due to the combustion of the nichrome wire?

Answer 1

Solution:

The total heat released is Q=q_naphthalene.+q_nichrome=C_v(delta T)

Here, q_naphthalene is the heat released fue to combustion of naphthalene,q_nichrome is the heat released due to burning of nichrome wire.C_v is the heat capacity constant of the calorimeter.

q_nichrome=m*(delta internal energy of the wire)

m is the mass of wire burnt.

Internal energy of wire is 5858 J/g.

q_nichrome=(0.0193-0.0045)g*(5858 J/g)=86.6984 J

The heat released due to burning of nichrome wire q_nichrome

is 86.6984 J