A wet clay brick measuring 2 * 4 * 6 inches has an initial water content uniform 12% by weight. At time t = 0, the brick is exposed on all sides to air so that the moisture content of the surface is kept at 2% by weight. After 5 h, the average moisture content is 8% by weight. Estimation: (a) the diffusivity of the water in the clay in cm2 / s; and (b) the additional time for the average moisture content to reach 4%. in weight. All moisture content is on a dry basis

The two naturally occurring isotopes of chlorine are 35cl (34.969 amu, 75.77%) and 37cl (36.966 amu, 24.23%). the two naturally occurring isotopes of bromine are 79br (78.918 rm amu, 50.69%) and 81br (80.916 amu, 49.31%). chlorine and bromine combine to form bromine monochloride, brcl. 1. how many peaks will be present in a mass spectrum for brcl? the four combinations of molecule possible given these four isotopes are: 81br37cl, 81br35cl, 79br37cl, and 79br35cl. 2. what are the masses of the four different brcl molecules? express the masses using six significant figures, in decreasing numeric order (highest to lowest), separated by commas.