NEET · Chemistry · STD 11 - 1. Some basic concept of chemistry
\(6.02 \times 10^{20}\) molecules of urea are present in \(100\ mL\) of its solution. The concentration of solution is.....\(M\)
- A \(0.001\)
- B \(0.1\)
- C \(0.02\)
- D \(0.01\)
Answer & Solution
Correct Answer
(D) \(0.01\)
Step-by-step Solution
Detailed explanation
Number of moles \(=\frac{\text { number of molocules }}{\mathrm{NA}}\) \(=\frac{6.02 \times 10^{20}}{6.02 \times 10^{23}}=10^{-3} \mathrm{mol}\) Molar conc \(=\frac{n \times 1000}{V_{\text {solution }(\mathrm{mL})}}=\frac{10^{-3} \times 1000}{100}\)
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