PR Kimia – om Braddy 11
11.48 The SI generally uses its base units to compute constants
involving derived units. The SI unit for volume, for
example,
is the cubic meter, called the stere, because the
meter is the base unit of length. We learned about the
SI unit of pressure, the pascal, in this chapter. The temperature
unit is the kelvin. Calculate the value of the gas
constant in the SI units, m3 Pa mol-1 K-1.
11.62 How many milliliters of O2 are consumed in the complete
combustion of a sample of hexane, C6H14, if the reaction
produces 855 mL of CO2? Assume all gas volumes are measured
at the same temperature and pressure. The reaction is
2C6H14( g) + 19O2( g) → 12CO2( g) + 14H2O( g)
11.64 Nitric acid is formed when NO2 is dissolved in water.
3NO2( g) + H2O(l ) → 2HNO3(aq) + NO( g)
How many milliliters of NO2 at 25 °C and 752 torr are
needed to form 12.0 g of HNO3?
11.72 A 0.200 mol sample of a mixture of N2 and CO2 with a
total pressure of 845 torr was exposed to an excess of solid
CaO, which reacts with CO2 according to the equation
CaO(s) + CO2( g) → CaCO3(s)
After the reaction was complete, the pressure of the gas
had dropped to 322 torr. How many moles of CO2 were
in the original mixture? (Assume no change in volume or
temperature.)
11.85 Two flasks (which we will refer to as flask 1 and flask 2)
are connected to each other by a U-shaped tube filled
with an oil having a density of 0.826 g mL-1. The oil
level in the arm connected to flask 2 is 16.24 cm higher
than in the arm connected to flask 1. Flask 1 is also connected
to an open-end mercury manometer. The mercury
level in the arm open to the atmosphere is 12.26 cm
higher than the level in the arm connected to flask 1. The
atmospheric pressure is 0.827 atm. What is the pressure
of the gas in flask 2 expressed in torr? (See the hint given
in Problem 11.84.)
11.88 Early one cool (60.0 °F) morning you start on a bike ride
with the atmospheric pressure at 14.7 lb in.-2 and the
tire gauge pressure at 50.0 lb in.-2. (Gauge pressure is the
amount that the pressure exceeds atmospheric pressure.)
By late afternoon, the air had warmed up considerably,
and this plus the heat generated by tire friction sent the
temperature inside the tire to 104 °F. What will the tire
gauge now read, assuming that the volume of the air in
the tire and the atmospheric pressure have not changed?
kamu itu lucu banget yaa.. mereka bercanda kali, kamu langsung serius gitu & pergi tiba2 ahaha.. kocak banget.. mana mungkinlah, wong baru juga masuk.. kamu itu udah mau lulus ya, tapi kok ya pikirannya kaya anak SD sih? tapi tetep lucu kok, ahaha..
ak minta maaf, ak buat salah besar..
tp ak tw, km tw sbnrnya..
dia mau blg apapun, yg terucap dgn yg ada di pikiran aku itu berbeda, sekali lagi ak minta maaf
) biasanya km pasti yg nenangin sambil ngebodor, skrg beda nih.. masing2 ditanggung sendiri T.T
