Question
Identify the correct statements:
A) The molality of 2.5 g of ethanoic acid (Molar mass: $60\text{ }g{\text{ }mol}^{- 1}$ ) in 75 g of benzene solution is 0.556 m.
B) The molarity of a solution containing 5 g of NaOH (molar mass: $40\text{ }g{\text{ }mol}^{- 1}$ ) in 450 mL of solution is 0.278 M at 298 K.
C) Aquatic species are more comfortable in cold water.
D) The solubility of gas increases with decrease in pressure.
E) For a binary mixture of A and B, the number of moles of A and B are $n_{A}$ and $n_{B}$ respectively. The mole fraction of $B$ will be $x_{B} = \frac{n_{A}}{n_{A} + n_{B}}$.
Choose the correct Ans. from the options given below:
Options
Solution
Sol. [Key Concept: Evaluating the correctness of given statements]
A) Molality $= \frac{2.5}{60} \times \frac{1000}{75} = 0.556$ molal
B) Molarity $= \frac{5}{40} \times \frac{1000}{450} = 0.278M$
C) Aquatic species are more comfortable in cold water
$$\text{~}\text{Henry's Law}\text{~}K_{H} \propto \text{~}\text{Temp}\text{~} \propto \frac{1}{\text{~}\text{solubility}\text{~}}$$
D) According to Henry's Law,
$${\begin{matrix} & P = K_{H}X \\ & P \propto X \\ & P \propto \text{~}\text{Solubility}\text{~} \end{matrix} }{ So\ as\ P \uparrow}$$, solubility ↑
E)$\ x_{B} = \frac{n_{B}}{n_{A} + n_{B}}$
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