What is the percent yield is 4.65 got copper is produced by 1.87 percent yield is got copper is produced when 1.87 grams of aluminum reacts with excess copper (11) sulfate

Harvey kept a balloon with a volume of 348 milliliters at 25.0˚c inside a freezer for a night.  when he took it out, its new volume was 322 milliliters, but its pressure was the same.  if the final temperature of the balloon is the same as the freezer’s, what is the temperature of the freezer? the temperature of the freezer is  kelvins.

How does a hydroelectric power plant converts energy into energy.

In this chemical reaction, 325 grams of barium (ba) react completely. how many moles of lithium (li) are produced?