The drain cleaner contains small bits of aluminium which react with caustic soda to produce dihydrogen gas. What volume of dihydrogen at 20°C and onebar pressure will be released when 0.15 g of aluminium reacts.
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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 same temperature the pressure becomes 3 bar. Find a relationship between their molecular masses.
Answer
Mass of gas A , WA = 1g
Mass of gas B, WB = 2g
Pressure exerted by the gas A = 2 bar
Total pressure due to both the gases = 3 bar
In this case temperature & volume remain constant
Now if MA & MB are molar masses of the gases A & B respectively,therefore
pA V= WA RT/MA & Ptotal V = (WA/MA + WB/ MB) RT
= 2 X V = 1 X RT/MA & 3 X V = (1/MA + 2/MB)RT
Answer
Mass of gas A , WA = 1g
Mass of gas B, WB = 2g
Pressure exerted by the gas A = 2 bar
Total pressure due to both the gases = 3 bar
In this case temperature & volume remain constant
Now if MA & MB are molar masses of the gases A & B respectively,therefore
pA V= WA RT/MA & Ptotal V = (WA/MA + WB/ MB) RT
= 2 X V = 1 X RT/MA & 3 X V = (1/MA + 2/MB)RT
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