JEE Mains · Chemistry · STD 11 - 1. Some basic concept of chemistry
The molality of a \(10 \%( v / v )\) solution of di-bromine solution in \(CCl _4\) (carbon tetrachloride) is \(x\). \(x=\) \(......\times 10^{-2}\,M\). (Nearest integer) [Given : molar mass of \(Br _2=160\,g\,mol ^{-1}\) atomic mass of \(C =12\,g\,mol ^{-1}\) atomic mass of \(Cl =35.5\,g\,mol ^{-1}\) density of dibromine \(=3.2\,g\,cm ^{-3}\) density of \(\left.CCl _4=1.6\,g\,cm ^{-3}\right]\)
- A \(138\)
- B \(139\)
- C \(137\)
- D \(136\)
Answer & Solution
Correct Answer
(B) \(139\)
Step-by-step Solution
Detailed explanation
\((10\,ml\) solute in \(90\,ml\) solvent \(\text { mass of solute }=10 \times 3.2=32\,g\) \(\text { mass of solvent }=90 \times 1.6\,g\) \(m =\frac{32 \times 1000}{160 \times 90 \times 1.6}=1.388\) \(m =138.8 \times 10^{-2}=139\)
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