Determine el porcentaje masa volumen de una solucion compuesta de 150g de etanol y 20g de agua cuyo volumen total es de 165ml

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the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.