A battery used in a mechanical toy stores 10,000 kJ of energy. The toy 5 points expends 7,500 kJ of energy before the battery runs out of energy. What is
the efficiency of the system?

Determine the number o moles of ions/atoms/particle in the following: 2.50 miles of k2s (let me know how to do)

Ammonia and oxygen react to form nitrogen monoxide and water, like this: 4nh3 (g) + 5o2 (g) → 4no (g) + 6h2o (g) also, a chemist finds that at a certain temperature the equilibrium mixture of ammonia, oxygen, nitrogen monoxide, and water has the following composition: compound pressure at equilibrium nh3 65.1atm o2 31.3atm no 62.7atm h2o 65.8atm compound pressure at equilibrium nh3 65.3 atm o2 7.79 atm no 12.1 atm h2o 65.8 atm calculate the value of the equilibrium constant kp for this reaction. round your answer to 2 significant

Which of the following units is not an official si unit