Why are fingertips wet with saliva before counting money?

Chemical kinetics what was the rate of reaction in trial 3? choose the closest answer.

What is the percent by mass of magnesium sulfate in mgso4.7h2o

Butane gas reacts with oxygen gas to give carbon dioxide gas and water vapor (gas). if you mix butane and oxygen in the correct stoichiometric ratio, and if the total pressure of the mixture is 390 mmhg, what is the pressure (in mmhg) of water vapor after the reaction is completed (temperature and volume do not change).