Idon’t get this lesson so can somebody me with the answer plz btw. this is chapter 2: lesson 1 : describing matter

For the following reaction, 5.65 grams of oxygen gas are mixed with excess hydrochloric acid . assume that the percent yield of water is 86.4 %. hydrochloric acid(aq) + oxygen(g) water(l) + chlorine(g) what is the ideal yield of water ? grams what is the actual yield of water ? grams

Which produce would best increase the amount of heat energy that is actually gained by calorimeter b

40dm3 of gas at 760 torr are heated from 5°c to 50°c what is the new volume