Question

Hydrazine, $N_{2}H_{4}$ a base like ammonia can react with $H_{2}SO_{4}$
$N_{2}H_{4}\left(\right.aq\left.\right)+H_{2}\left(SO\right)_{4}\left(\right.aq\left.\right) \rightarrow N_{2}H_{5}^{+}\left(\right.aq\left.\right)+SO_{4}^{2 -}\left(\right.aq\left.\right)$
What mass of hydrazine reacts with $250ml$ of $0.2MH_{2}SO_{4}$ ?

• A. $320g$
• B. $3.2g$
• C. $1.6g$
• D. $6.4g$

Answer 1

Answer: (B)

$2N_{2}H_{4}\left(\right.aq\left.\right)+H_{2}\left(SO\right)_{4}\left(\right.aq\left.\right) \rightarrow 2N_{2}H_{5}^{+}\left(\right.aq\left.\right)+SO_{4}^{2 -}\left(\right.aq\left.\right)$
$m_{N_{2} H_{4}}=\frac{32 \times 2 \times 250 \times 0 . 2}{1000}g=3.2g$