Question

U. 2. A barometer measures a pressure of 745 mm Hg. What is this pressure in atm? 0.980 atm d 1.00 x 10 atm а. b. 1.02 atm. е. 0.556 atm 1.03 x 10 atm С.

Answer 1

Convert pressure mm Hg to atm Given that 745 mmHg 1 atm = 760 mmHg ImmHg = an atm Therefore 745 mmHg = 745x atm = 0.980 atm 745mmHg = 0.980 atm Answer is option(a) (5) To find the final volume of the gas According to charles'law V_V₂ T, T, where Vi = initi al volume T, = initial temperature V = final volume T, = final temperature The pressure is constant V, = 25.0 mL T, = 25+273 K = 298K V= ? T, = 40 +273 K = 313K V.V 25.0 mLV 298K 313K Cross multiplication are allowed 25.0 mL <313K = V, 298K 25.0mL x 313K V= 298K = 26.2mL Hence the final volume of the gas (V2) = 26.2mL Answer is option(a)