What volume of H2 gas at 750.0 mmhm and 25 degrees C is produced from the reaction of 50.0 mL of 0.214 M H2SO4 and 0.300 g of Al?

Which actions would increase the rate at salt dissolves in water? stir the water? crush the salt? use less water? heat the water? cool the salt

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

Acalorimeter is to be calibrated: 51.203 g of water at 55.2 degree c is added to a calorimeter containing 49.783 g of water at 23.5c. after stirring and waiting for the system to equilibrate, the final temperature reached is 37.6 degree c. specific heat capacity of water (s = 4.18 j/g∙degree c). calculate the calorimeter constant. (smδt)warm water = -[(smδt)cold water + (calorimeterδtcold water)]