what is the simplest formul of the compound wnich has the following percentage composition C=80%H=20% If the molecular mass is 30,calculate its molecular formula
Answers
Explanation:
h+ o+c
hydrogen+ oxygen+ water
Answer:
Calculation of empirical formula:
Element
Percentage
Atomic mass
Relative number of moles
Simple ratio
Simplest whole number ratio
C
H
80
20
12
1
begin mathsize 11px style 18 over 12 space equals space 6.66
20 over 1 space equals space 20 end style
begin mathsize 11px style fraction numerator 6.66 over denominator 6.66 end fraction space equals space 1
fraction numerator 20 over denominator 6.66 end fraction space equals space 3 end style
1
3
Therefore Empirical formula is CH3
Calculation of molecular formula:
Empirical formula mass = 12 × 1 + 1 × 3 = 15
begin mathsize 11px style straight n space equals space fraction numerator Molecular space mass over denominator Empirical space formula space mass end fraction space equals space 30 over 15 space equals space 2 end style
Molecular formula = Empirical formula × 2
= CH3 × 2 = C2H6.
Explanation:
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