What is the pressure of the gas in this mercury manometer if h = 81 mm and atmospheric pressure is 749 mmHg

Asample of freon gas has a volume of 2.23 liters, a pressure of 4.85 kpa, and a temperature of -1.36°c. calculate the volume at a pressure of 1.38 kpa and a temperature of 5.5°c. (show work)

What is the common name for the compound shown here? enter the common name of the compound shown?

What properties would have caused early researchers to name hydrogen "inflammable air”