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Some Basic Concepts of Chemistry question

2023 · 29 Jan · Shift 2 · Q20
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  5. /2023 · 29 Jan · Shift 2 · Q20

Some Basic Concepts of Chemistry question

2023 · 29 Jan · Shift 2 · Q20

JEE MainChemistrySome Basic Concepts of ChemistryNumerical+4 / −1
When 0.01 mol of an organic compound containing 60% carbon was burnt completely, 4.4 g of CO 2_22​ was produced. The molar mass of compound is ‾\underline{\hspace{2cm}}​ g mol −1^{-1}−1 (Nearest integer).
Numerical answer
View written solutionFree

Correct answer: 200

  1. Given data

    • Amount of organic compound burnt =0.01 mol= 0.01\ \text{mol}=0.01 mol
    • Carbon percentage in compound =60%= 60\%=60%
    • Mass of CO2\text{CO}_2CO2​ produced =4.4 g= 4.4\ \text{g}=4.4 g
  2. Find moles of CO2\text{CO}_2CO2​ formed n(CO2)=4.444=0.1 moln(\text{CO}_2)=\frac{4.4}{44}=0.1\ \text{mol}n(CO2​)=444.4​=0.1 mol

  3. Find moles of carbon in the compound sample Each mole of CO2\text{CO}_2CO2​ contains 1 mole of C, so: n(C)=0.1 moln(\text{C})=0.1\ \text{mol}n(C)=0.1 mol

  4. Find mass of carbon in the sample m(C)=0.1×12=1.2 gm(\text{C})=0.1\times 12=1.2\ \text{g}m(C)=0.1×12=1.2 g

  5. Use carbon percentage to find total mass of compound burnt Since carbon is 60%60\%60% of the compound by mass, 1.2msample=0.60\frac{1.2}{m_{\text{sample}}}=0.60msample​1.2​=0.60 msample=1.20.60=2.0 gm_{\text{sample}}=\frac{1.2}{0.60}=2.0\ \text{g}msample​=0.601.2​=2.0 g

  6. Find molar mass of the compound We are told that 2.0 g2.0\ \text{g}2.0 g corresponds to 0.01 mol0.01\ \text{mol}0.01 mol. Therefore, M=2.00.01=200 g mol−1M=\frac{2.0}{0.01}=200\ \text{g mol}^{-1}M=0.012.0​=200 g mol−1

  7. Final answer 200\boxed{200}200​

  8. Comparison with stored answer Stored correct answer = 200200200

    My derived answer matches the stored answer.

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