The standard enthalpy of formation is the energy that would be involved if one mole of the substance were to be formed from its elements that were at standard conditions of temperature and pressure which are 25 degrees C and one atm pressure.
About 10. He would go 5 yads per second × 60 to get 300 yards per minute. ×60 to get 18000 yard per hour. Than you divide 18000 by 1760 to get about 10
