Harry has a sample of an unknown material. the sample has a mass of 81 grams and a volume of 0.9 cubic centimeters. what is the density of the sample in grams per cubic centimeter?

Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.