Advertisements
Advertisements
Question
Hydrochloric acid is treated with a metal to produce hydrogen gas. Suppose a student carries out this reaction and collects a volume of 154.4 × 10−3 dm3 of a gas at a pressure of 742 mm of Hg at a temperature of 298 K. What mass of hydrogen gas (in mg) did the student collect?
Advertisements
Solution
Given, V = 154.4 × 10−3 dm3
P = 742 mm of Hg
T = 298 K
m = ?
n = `"PV"/"RT"`
= `(742 "mm Hg" xx 154.4 xx 10^-13 "L")/(62 "mm Hg L K"^-1 "mol"^-1 xx 298 "K")`
= 0.006 mol
n = `"Mass"/("Molar mass")`
Mass = n × Molar Mass
= 0.0006 × 2.016
= 0.0121 g
= 12.1 mg
APPEARS IN
RELATED QUESTIONS
State (i) the three variables for gas laws and (ii) SI units of these variables.
Convert 0.124 torr to the standard atmosphere
With the help of the graph answer the following -
At constant temperature, the Graph shows the relationship between pressure and volume. Represent the relation mathematically.
With the help of the graph answer the following -
At constant temperature, Identify the law.
Solve the following.
A balloon is inflated with helium gas at room temperature of 25°C and at 1 bar pressure when its initial volume is 2.27L and allowed to rise in the air. As it rises in the air external pressure decreases and the volume of the gas increases till finally, it bursts when external pressure is 0.3bar. What is the limit at which the volume of the balloon can stay inflated?
Assertion: Critical temperature of CO2 is 304 K, it can be liquefied above 304 K.
Reason: For a given mass of gas, volume is to directly proportional to pressure at constant temperature
Explain the following observation.
Liquid ammonia bottle is cooled before opening the seal
A sample of gas has a volume of 8.5 dm3 at an unknown temperature. When the sample is submerged in ice water at 0°C, its volume gets reduced to 6.37 dm3. What is its initial temperature?
A certain sample of gas has a volume of 0.2 L at one atmosphere pressure and 273.15 K. What is the volume of gas at 273.15°C at same pressure?
If 2 moles of an ideal gas at 546 K has volume of 44.8 L, then what will be it's pressure? (R = 0.082)
