A100.0 ml sample of 0.200 m hcl is mixed with a 100.0 ml sample of 0.205 m naoh in a coffee cup calorimeter. if both solutions were initially at 25.0 c and the temperature of the resulting solution was recorded as 27.0 c, determine the delta hrxn (in kj/mol). assume no heat is lost to the calorimeter. hint: what is the limiting reagent?

How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.

Select all of the statements which are true. electrons are located in shells or orbits around the atom. electrons orbit slowly around the atom. electrons travel in one flat path around the nucleus of an atom. the valence of an atom is determined by the number of electrons in the atom's outermost shell.

Calculate the estimated density of each ball. use the formula d = m/v where d is the density, m is the mass, and v is the volume. record your calculations in table a of your student guide. given that the density of water is 1.0 g/cm3, make a prediction about whether each ball will float in water. record your prediction in table a. what is the estimated density of the table tennis ball? record your answer to the nearest hundredth