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Question : 90 of 200
Marks:
+1 ,
-0
Solution:
Given,
C = 42.8 % , H = 7.2 % and
N = 50 % Element % Moles Simplest ratio Whole number C 42.8 ‌ = 3.56 1 1 H 7.2 ‌ = 7.2 2 2 N 50 ‌ = 3.57 1 1
∴ ‌ ‌ ‌ Empirical formula ‌ ‌ ‌ = C H 2 N ‌ Empirical formula mass ‌ ‌ ‌ = 28 Now, number of moles
= ‌ ‌ ‌ ‌ Volume given at STP ‌ 22400 m L
‌ ‌ = ‌ = 2.23 × 10 − 3 ‌ Also, number of moles ‌ = ‌ ‌ Weight ‌ ‌ Molecular weight ‌
‌ Molecular weight ‌ ‌ ‌ = ‌ = 448 ∴ n = ‌ ‌ Molecular weight ‌ ‌ Empirical weight ‌
= ‌ = 16 Hence, molecular formula
= ( ‌ empirical formula ‌ ) n = ( C H 2 N ) 16 = C 16 H 32 N 16 © examsiri.com
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