(A) Vitamin B 2 , riboflavin, is soluble in water. If 0.833 g of riboflavin is dissolved...
Question:
(A) Vitamin B2, riboflavin, is soluble in water. If 0.833 g of riboflavin is dissolved in 18.1 g H2O, the resulting solution has a freezing point of -0.227 °C.
(a) What is the molality of the solution?
(b) What is the molar mass of riboflavin? (c) What is the molecular formula of riboflavin if combustion analysis shows it to consist of 54.25% C, 5.36% H, 25.51% O, and 14.89% N?
(B) An aqueous solution that is 0.205 mol kg–1 urea, CO(NH2)2, is found to boil at
100.025 °C. Is the prevailing barometric pressure above or below 760.0 mmHg?
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Step by Step Answer:
A Lets start with part a a To find the molality m we can use the formula AT Km where AT is the freez...View the full answer
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Related Book For 
General Chemistry Principles And Modern Applications
ISBN: 9780132931281
11th Edition
Authors: Ralph Petrucci, Jeffry Madura, F. Herring, Carey Bissonnette
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