Is the number 5x10 to the power of -4 greater than or less than 1.0?

 The number will be less than 1.0

Explanation: number can be written as 0.0005 as the power of the 10 is in negative digits which comes into the point digits after evaluating carefully.

Thus it is clear that 1.0 is bigger than 0.0005.

Thus the number 5x10 to the power of -4 is less than 1.0

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.

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