A sample of air was collected on a day when the total atmosphere pressure was 795 mmHg. The sample contained only oxygen and nitrogen gas. If the nitrogen
in the sample had a pressure of 115 mmHg, how much pressure did the oxygen
have?
O 680 mm Hg
O 474 mmHg
O 913 mmHg
O 6.93 mmHg
O Other

a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.

> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.