A gas bottle contains 0.650 mol of gas at a pressure of 730torr. more gas was added to the bottle and the final pressure was 1.15atm. how many moles of gas were added to the bottle?
a. 0.0680mol
b. 0.128mol
c. 0.717mol
d. 0.788mol
e. more information is needed.
2007-12-16 08:48:32 · 2 answers · asked by Neha G 1 in Science & Mathematics ➔ Chemistry
Using PV = nRT for before and after, with V and T constant,
n1/P1 = n2/P2.
Or in plain words,pressure is proportional to moles of gas.
the question mixes up torr and atm; sneaky, but just remember to convert to the same units.
2007-12-16 08:56:51 · answer #1 · answered by Facts Matter 7 · 0⤊ 1⤋
1.15atm = 874torr.
0.650 mol. ÷ 730 torr = 0.0009 mol/torr.
0.0009mol/torr x 874 torr = 0.778mol.
0.778mol - 0.650 mol = Answer b...0.128mol. added.
2007-12-16 17:22:39 · answer #2 · answered by Norrie 7 · 1⤊ 0⤋