Mole ConceptHard
Question
When 1 g of compound ( X ) is subjected to Kjeldahl's method for estimation of nitrogen, 15 $mL,1MH_{2}{SO}_{4}$ was neutralized by ammonia evolved. The percentage of nitrogen in compound $(X)$ is :
Options
A.21
B.0.42
C.42
D.0.21
Solution
eq. of $H_{2}{SO}_{4} =$ eq. of Ammonia
$\Rightarrow \frac{15 \times 1 \times 2}{1000} =$ moles of ammonia $\times 1$
⇒ Moles of ammonia $=$ moles of ' N '
⇒ Weight of nitrogen $= \frac{15 \times 1 \times 2}{1000} \times 14 = 0.42$
% weight of ' $N' = \frac{0.42}{1} \times 100 = 42\%$
Create a free account to view solution
View Solution FreeMore Mole Concept Questions
Air contains 20% O2 by volume. What volume of air is needed at 0o C and 1 atm for complete combustion of 80 g methane?...A certain vitamin extracted from plant sources has carbon and hydrogen in 8: 1 mass ratio. The percentage of oxygen is n...Some bottles of colourless liquids were being labelled when the technicians accidentally mixed them up and lost track of...In a textile mill, a double effect evaporator system concentrates weak liquor containing 4% (by mass) caustic soda to pr...A mixture of 254 g of iodine and 142 g of chlorine is made to react completely to give a mixture of ICl and ICl3. How ma...