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Calculations of MW and observed rotation

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1.The hormone insulin contains 3.4% sulfur. What is the minimum molecular weight of insulin?

The actual molecular weight is 5734; how many sulfur atoms are probably present per molecule? (Please explain reasoning clearly).

2. The specific [alpha] of (-)-morphine is -132 degrees. What will the be the observed rotation when using a solution whose concentration is 10.0g per 255 ml and polarimeter sample cell of 20.0 cm long?

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The expert examines calculations of MW and observed rotations.

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