The structure of hydrogen sulphide (Mr = 34.1 g mol-1 ) is analogous to water (Mr = 18.0g
mol-1
). Despite having larger molecular mass than water, the boiling point of hydrogen

sulphide at STP is -60.2°C whereas the boiling point of water is 99.61 °C under the same

condition. Explain this observation.

he uptake of drugs from the intestine is often strongly influenced by diffusion. for example, consider a water-insoluble steroid for treating inflammation that is solubilized in aggregates of detergent molecules, called micelles. these micelles, aggregates of 80 soap molecules, have a molecular weight of 24,000, a diameter of 2.6 nm, and a charge of -27. the positively charge ions (counterions) in this system are na".

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