Chemistry-
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Easy

Question

A solution is prepared by dissolving a 2.5 g sample of an unknown compound in 34 g of benzene open parentheses C subscript 6 end subscript H subscript 6 end subscript close parentheses boils at 1.3 SoC higher than pure benzene. Which expression gives the molar mass of the unknown compound?

  1. 2.53 cross times fraction numerator 2.50 over denominator 1.38 end fraction    
  2. 1.38 cross times fraction numerator 34 over denominator 2.53 end fraction cross times 2.50    
  3. 2.5 cross times 10 to the power of 3 end exponent cross times fraction numerator 2.53 over denominator 34 end fraction cross times fraction numerator 1 over denominator 1.38 end fraction    
  4. 2.50 cross times 10 to the power of 3 end exponent cross times fraction numerator 1.38 over denominator 34 end fraction cross times 2.53    

The correct answer is: 2.5 cross times 10 to the power of 3 end exponent cross times fraction numerator 2.53 over denominator 34 end fraction cross times fraction numerator 1 over denominator 1.38 end fraction

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