Assume that the complete combustion of one mole of ethanol to carbon dioxide and water liberates 1370 kj of energy (δ°′=−1370 kj/mol ). if the energy generated by the combustion of ethanol is entirely converted to the synthesis of a hypothetical compound x, calculate the number of moles of the compound that could theoretically be generated. use the value δ°′compound x=−45.9 kj/mol . round your answer to two significant figures.

Aball is thrown from the top of a building with an initial velocity of 21.9 m/s straight upward, at an initial height of 51.6 m above the ground. the ball just misses the edge of the roof on its way down, as shown in the figure. (a) determine the time needed for the ball to reach its maximum height. (b) determine the maximum height. (c) determine the time needed for the ball to return to the height from which it was thrown, and the velocity of the ball at that instant. (d) determine the time needed for the ball to reach the ground. (e) determine the velocity and position of the ball at t = 5.35 s.