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Solve the following problems · Q38

Q.An organic compound containing oxygen, carbon, hydrogen and nitrogen contains 20 % carbon, 6.7 % hydrogen and 46.67 % nitrogen. Its molecular mass was found to be 60. Find the molecular formula of the compound. (Ans.: CH4N2O)

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Step 1. %O by difference =100−20−6.7−46.67=26.63%= 100 - 20 - 6.7 - 46.67 = 26.63\%.

Step 2. Moles: C =20/12=1.667= 20/12 = 1.667; H =6.7/1=6.7= 6.7/1 = 6.7; N =46.67/14=3.333= 46.67/14 = 3.333; O =26.63/16=1.664= 26.63/16 = 1.664.

Step 3. Divide by the smallest (≈1.664–1.667): C ≈1\approx 1; H ≈4.03≈4\approx 4.03 \approx 4; N ≈2.00\approx 2.00; O =1= 1, giving empirical formula CH4N2O. …

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