How long in hours would it take a runner to finish an 11 km race if she is running at a pace of 5.7 mi/hr?

It would take 1.16 h for the runner to finish the race .

Step 1. Convert kilometres to miles.

11 km × (0.621 mi/1 km) = 6.83 mi

Step 2. Calculate the time.

Time = 6.83 mi × (1 h/5.7 mi) = 1.16 h

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.