2.3 A combustion of 3.87 mg sample of a certain vitamin, that contains C, H and 0. gave 5.80 mg of CO2 and 1.58 mg of H2O. Calculate the percentage composition of C, H and O in this vitamin. (8)​

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Thus, the proportion of Earth's surface that is covered by ice and snow affects how much of the Sun's solar radiation is absorbed, warming the planet, or reflected. Therefore, snow and ice which are covered in soot from pollution no longer reflect sunlight, but absorb it and so melting increases.