Chemistry
Grade-9
Easy
Question
The volume of Hydrogen liberated at 270C and 760mm of Hg pressure by treating 1.2g of magnesium with excess of hydrochloric acid is:
- 1.22 L
- 1.23 L
- 1.35 L
- 1.45 L
Hint:
760 mm pressure = 1 atm
The correct answer is: 1.23 L
Mg+2HCl→MgCl2 + H2
Moles of Mg=1.2/24 =0.05
Moles of H2 formed =0.05
760 mm pressure = 1 atm
Volume of hydrogen gas liberated = nRT/P =10.05×0.0821×300=1.23 litres
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