10.0 grams of pure I-131 (iodine-131 atom number: 131) are prepared. Half life of I-131 t1 / 2 = 8.3 days. How many grams of I-131 will remain 30 days after preparation? (A unit of atomic mass Note that 1 (amu) = 1.66 x 10 -24 g.) N's in the equation below represent the number of atoms. so you have to calculate the number of atoms in 1.0 grams of I-131, which is the number of atoms in 10 g. Find the number

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Units and Dimensions

Dimensions are the basic concepts of the measurement of quantities. Units are the means of expressing the dimensions. For instance, an area has a dimension of L2 and a unit of m2.