A closed cylinder contains 850 mL of orygen gas at 790 mmHg pressure and 20'c tempore Calculate the mass of oxygen in that cylinder. (R = 0.0821 lit. atm. Kimer') Solution: $50 ml =0.85 lit) .

Which position represents spring in the southern hemisphere? a) b) c) d)

The following reaction shows sodium carbonate reacting with calcium hydroxide. na2co3 + ca(oh)2 → naoh + caco3 how many grams of naoh are produced from 20.0 grams of na2co3? (molar mass of na = 22.989 g/mol, c = 12.01 g/mol, o = 15.999 g/mol, ca = 40.078 g/mol, h = 1.008 g/mol) 12.2 grams 15.1 grams 24.4 grams 30.2 grams

Achemist has dissolved a certain substance in water. the chemist knows that more of the substance could be dissolved into the water before it stops dissolving. therefore