An incandescent light bulb emits some heat to a room through radiation. approximate the light bulb as a sphere with radius 2.1 cm and having a surface temperature of 97 °c when turned on. a. what is the rate of heat transfer to the room with tsur 24 °c? the emissivity, e, of glass is 0.93. b. if the light bulb is a 25w light bulb, what fraction of the power going to the light bulb is used inefficiently to produce heat?

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

b. is the answer hoped i