To solve the problem, we need to balance the chemical equation and find the values of A, B, C, and D in the equation:
1. Given Equation:
The unbalanced chemical equation is:
$ A \, \text{Na} + B \, \text{H}_2\text{O} \rightarrow C \, \text{NaOH} + D \, \text{H}_2 $
2. Balancing the Equation:
Let's balance the atoms on both sides of the equation:
Na: There is 1 Na on the left side (from Na) and 1 Na on the right side (from NaOH), so $ A = 1 $ and $ C = 1 $.
H: There are 2 H atoms from water (H2O) on the left side and 2 H atoms in NaOH and 2 H atoms in H2 on the right side. So, $ B = 1 $ and $ D = 1 $.
O: There is 1 O atom in NaOH on the right side, which balances the 1 O atom in H2O on the left side. Thus, $ B = 1 $ and $ C = 1 $.
3. Final Balanced Equation:
The balanced equation is:
$ 1 \, \text{Na} + 1 \, \text{H}_2\text{O} \rightarrow 1 \, \text{NaOH} + 1 \, \text{H}_2 $
Final Answer:
The values of A, B, C, and D are $ \mathbf{A = 1, B = 1, C = 1, D = 1} $.
Which element of the 3d series has the lowest enthalpy of atomisation and why?
Methanol is produced by the reversible, gas-phase hydrogenation of carbon monoxide: \[ {CO} + 2{H}_2 \rightleftharpoons {CH}_3{OH} \] CO and H$_2$ are charged to a reactor, and the reaction proceeds to equilibrium at 453 K and 2 atm. The reaction equilibrium constant, which depends only on the temperature, is 1.68 at the reaction conditions. The mole fraction of H$_2$ in the product is 0.4. Assuming ideal gas behavior, the mole fraction of methanol in the product is ____________ (rounded off to 2 decimal places).
The residence-time distribution (RTD) function of a reactor (in min−1) is:
\[ E(t) = \begin{cases} 1 - 2t, & \text{if } t \leq 0.5\ \text{min} \\ 0, & \text{if } t > 0.5\ \text{min} \end{cases} \]
The mean residence time of the reactor is _____ min (rounded off to 2 decimal places).
Oil is extracted from mustard seeds having 20 wt% oil and 80 wt% solids, using hexane as a solvent. After extraction, the hexane-free residual cake contains 1 wt% oil. Assuming negligible dissolution of cake in hexane, the percentage oil recovery in hexane is ___________ % (rounded off to the nearest integer).