For the reaction 2H2 + O2 - 2H2O, if 30.0 g of H2 is reacted with 20.0 g of O2 what mass of the excess reagent is left over? ​

24. a sports ball is inflated to an internal pressure of 1.85 atm at room temperature (25 °c). if the ball is then played with outside where the temperature is 7.5 °c, what will be the new pressure of the ball? assume the ball does not change in volume nor does any air leak from the ball a) 0.555 atm b) 1.74 atm c) 1.85 atm d) 1.97 atm

Using data from seismic waves, geologists have learned that earth’s interior is made up of several

How many mmols of tris-hcl are there in 100 ml of a 100 mm tris-hcl buffer solution at ph 8.1? note that the 100 mm refers to the sum of tris and tris-hcl concentrations?