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.

For this car, predict the shape of a graph that shows distance (x) versus time (t). note that time is the independent variable and will be on the bottom axis. need asap

Uranium has two naturally occurring isotopes. 238u has a natural abundance of 99.3% and 235u has an abundance of 0.7%. it is the rarer 235u that is needed for nuclear reactors. the isotopes are separated by forming uranium hexafluoride uf6, which is a gas, then allowing it to diffuse through a series of porous membranes. 235uf6 has a slightly larger rms speed than 238uf6 and diffuses slightly faster. many repetitions of this procedure gradually separate the two isotopes. what is the ratio of the rms speed of 235uf6 to that of 238uf6? express your answer to five significant figures.

According to the image below, which season is about to begin in the southern hemisphere? a. summer b. autumn c. winter d. spring