calculate the pH at 25 degrees Celsius of a 0.61 m solution of a weak base be with a kb of 1.5 x 10^-4​

Problem page gaseous ethane reacts with gaseous oxygen gas to produce gaseous carbon dioxide and gaseous water . if of water is produced from the reaction of of ethane and of oxygen gas, calculate the percent yield of water. be sure your answer has the correct number of significant digits in it.

At a temperature of 393 k, the temperature of a sample of nitrogen is 1.07 atm what will the pressure be at a temperature of 478 k

How many moles of air are there in a human lung with a volume of 2.4 l at stp? explain your answer