A 2.00-L glass soda bottle filled only with air is tightly capped at 23°C and 690.0 mmHg. If the bottle is pla?
I changed temperature to celsius, and pressure to atm. I used PV/T=PV/T (Combined gas law). I got the answer of 555mmHg, but it says that the correct answer is 858mmHg. help please?? what am i doing wrong??
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ok,first, if the answer is 858mmHg, i can work backwards to help you to the problem despite not getting the complete question
second, in any gas law problem, temperature MUST BE in kelvin. this is Temp in C + 273
third, if we had to use a gas constant, pressure wouldn't be used as mmHg but atm or Pa but here, we can use mmHg since it is the same unit on both sides.
you need to use the combined gas law
p1v1/t1 = p2v2/t2
690mmHg x 2L / 296K = p2(what you are looking for) x v2 (probably listed in the question) / t2 (again probably listed in the question)
solving for p2:
p1v1t2/p2t1 = p2