Measure the length of the pencil using the ruler below be sure to include the correct number of significant figures in your answer

he would use the colour black

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.

c. 4.54 x 10–12 j happens to be correct