4- A student measured the diameter of a sphere and determined the average value. His measyrements are 5.17cm , 5.16 cm cm and 5.17 cm if the diameter is 6.18cm what can be said about the student's results (a) it is accurate and precise (b) it is accurate but not precise (c) it is orecise but not accurate (d) it is neither precise nor accurate 5_ Combustion of hydrogen releases 142kj per gram of hydrogen reacted. How many kilocalories of energy are released by the combustion of 16.0 ounces of hydrogen (a) 1.31kcal (b) 19.2 kcal (c) 1.54x10^4 kcal (d) 2.69x10^5kcal (6) a mass of mercury occupies 0.950L what volume would an equal mass of ethanol occupy? the density of mercury is 13.546g/ml and the density of ethanol is 0.789b/ml (a) 0.0553L (b) 0.0613L (c) 16.3L (d) 18.1L