Which action do researchers take to make advances in science?

The enthalpy of formation of water is -285.8 kj/mol. what can be inferred from this statement?

Remember to use the proper number of significant figures and leading zeros in all calculations.gelatin has a density of 1.27 g/cm³. if you have a blob of gelatin dessert that fills a 2.0 liter bottle, what is its mass? 2540 g2500 g3.9 x 10-43.937x 10-4

If 22.5 liters of oxygen reacted with excess of hydrogen, how many liters of water vapor could be produced?