What is the percent yield of the decomposition reaction if 12.3 g of Pb(NO3)2
are heated to give 5.5g PbO?
2Pb(NO3)2 --> 2PbO +4NO2 +O2

a 72%
b 54%
c 74%
d 60%
e 41%
f 66%
g 63%
h 69%

Before it was launched, a helium-filled balloon had a pressure of 201 kpa at a temperature of 27°c. at an altitude of 15,000 m, the pressure had decreased to 2.5 kpa and the temperature had dropped to -14 °c. the volume of the balloon increased to 59.3 m3. what is the original volume of the balloon? 13 m3 0.85 m3 0.077 m3 1.17 m3