Advertisements
Advertisements
प्रश्न
The drain cleaner, Drainex contains small bits of aluminum which react with caustic soda to produce dihydrogen. What volume of dihydrogen at 20 °C and one bar will be released when 0.15g of aluminum reacts?
उत्तर
The chemical equation for the reaction is
\[\ce{\underset{\ce{2 x 27 g}}{2 Al} + 2 NaOH + 2H2O -> 2NaAlO2 + \underset{\ce{3 x 22400 mL}}{3H2}}\]
At STP (273.15 K and 1 atm), 54 g (2 × 27 g) of Al gives 3 × 22400 mL of H2..
∴ 0.15 g Al gives `(3xx22400xx0.15)/54`mL of H2 i.e., 186.67 mL of H2.
= 186.7 mL
S.T.P condition `"V"_1` = 186.7 mL , `"V"_2 = ?`
`"P"_1` = 1.013 bar , `"P"_2` = 1 bar
`"T"_1` = 0 + 273 = 273 K, `"T"_2` = 20 + 273 = 293 K
Accourding to gas equation
`("P"_1"V"_1)/"T"_1 = ("P"_2"V"_2)/"T"_2` or
`"V"_2 = ("P"_1"V"_1"T"_2)/("P"_2"T"_1)`
`"V"_2 = (1.013 " bar" xx 186.7 " mL" xx 293" K")/ (1 "bar" xx 273 " K")`
= 203 mL
APPEARS IN
संबंधित प्रश्न
If 10 volumes of dihydrogen gas reacts with five volumes of dioxygen gas, how many volumes of water vapour would be produced?
At 0°C, the density of a certain oxide of a gas at 2 bar is same as that of dinitrogen at 5 bar. What is the molecular mass of the oxide?
The pressure of 1 g of an ideal gas A at 27 °C is found to be 2 bar. When 2 g of another ideal gas B is introduced in the same flask at the same temperature the pressure becomes 3 bar. Find a relationship between their molecular masses.
The density of a gas is found to be 5.46 g/dm3 at 27 °C at 2 bar pressure. What will be its density at STP?
How much time would it take to distribute one Avogadro number of wheat grains, if 1010 grains are distributed each second?
____________ states that equal volumes of all gases under identical conditions of temperature and pressure contain equal number of molecules.
Which of the following hydride does not obey law of constant proportion?
The number of atoms present in one mole of an element is equal to Avogadro number. Which of the following element contains the greatest number of atoms?
Avogadro's law distinguishes between ______.
The weight of 350 mL of a diatomic gas at 0°C and 2 atm pressures is 1 g. The weight of one atom in gram is: (N = Avogadro's number)
