Gases Chemistry Worksheet - Chapter 13, An Introduction To Chemistry Page 40
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Chapter 13
Gases
57.
Bromomethane, CH
Br, commonly called methyl bromide, is used as a soil
O
15
bjeCtive
3
fumigant, but because it is a threat to the ozone layer, its use is being phased
out. This colorless gas is toxic by ingestion, inhalation, or skin absorption, so
the American Conference of Government Industrial Hygienists has assigned it
a threshold limit value, or TLV, a maximum concentration to which a worker
may be repeatedly exposed day after day without experiencing adverse effects.
(TLV standards are meant to serve as guides in control of health hazards, not to
provide definitive dividing lines between safe and dangerous concentrations.)
Bromomethane reaches its TLV when 0.028 moles escape into a room that
3
and a temperature of 18 °C. What is the pressure in
has a volume of 180 m
3
3
atmospheres of the gas under those conditions? (There are 10
L per m
.)
58. Sulfur hexafluoride is a very stable substance that is used as a gaseous insulator for
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15
bjeCtive
electrical equipment. Although SF
is considered relatively safe, it reaches its TLV
6
(defined in question 57) when 143 moles of it escape into a room with a volume
3
and a temperature of 21 °C. What is its pressure in pascals for these
of 3500 m
conditions?
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15
59.
Gaseous chlorine, Cl
, used in water purification, is a dense, greenish-yellow
bjeCtive
2
substance with an irritating odor. It is formed from the electrolysis of molten
sodium chloride. Chlorine reaches its TLV (defined in question 57) in a
laboratory when 0.017 moles of Cl
are released yielding a pressure of
2
-4
7.5 × 10
mmHg at a temperature of 19 °C. What is the volume in liters of the
room?
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15
60. Hydrogen bromide gas, HBr, is a colorless gas used as a pharmaceutical
bjeCtive
intermediate. Hydrogen bromide reaches its TLV (defined in question 57) in a
laboratory room when 0.33 moles of it are released yielding a pressure of 0.30 Pa
3
at a temperature of 22 °C. What is the volume in m
of the room?
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16
61.
Hydrogen sulfide, H
S, used to precipitate sulfides of metals, is a colorless gas
bjeCtive
2
3
that smells like rotten eggs. It can be detected by the nose at about 0.6 mg/m
. To
3
reach this level in a 295 m
room, 0.177 g H
S must escape into the room. What
2
3
is the pressure in pascals of 0.177 g H
S that escapes into a 295-m
laboratory
2
room at 291 K?
, is a reddish-brown gas above 21.1 °C and a brown
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16
62. Nitrogen dioxide, NO
bjeCtive
2
liquid below 21.1 °C. It is used to make nitric acid and as an oxidizer for rocket
fuels. Its TLV (defined in question 57) is reached when 1.35 g of NO
escape
2
3
into a room that has a volume of 225 m
. What is the pressure in millimeters of
3
mercury of 1.35 g of NO
at 302 K in a 225-m
room?
2
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63.
Hydrogen chloride, HCl, is used to make vinyl chloride, which is then used to
bjeCtive
make polyvinyl chloride (PVC) plastic. Hydrogen chloride can be purchased in
liquefied form in cylinders that contain 8 lb HCl. What volume in liters will
8.0 lb HCl occupy if the compound becomes a gas at 1.0 atm and 85 °C?
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