If a tank has a pressure of 135.0 kPa, a volume of 40.0 L, and is held at 30.0 degree Celcius, what would be the number of moles of gas is muxture is 20% gas A and 80% gas B?

What type of matter is made of only one kind of atom

Nitric acid can be formed in two steps from the atmospheric gases nitrogen and oxygen, plus hydrogen prepared by reforming natural gas. in the first step, nitrogen and hydrogen react to form ammonia: (g) (g) (g) in the second step, ammonia and oxygen react to form nitric acid and water: (g) (g) (g) (g) calculate the net change in enthalpy for the formation of one mole of nitric acid from nitrogen, hydrogen and oxygen from these reactions. round your answer to the nearest .

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