Activity: How many grams of BaCl2 · 2H20 should we weigh out to prepare 250 cm of a 0.5 M solution of BaCl2? Use values of atomic masses correct to one decimal place. Enter the final result correct to one decimal place. Cm = 0.5 M V = 250 cm3 %3D m = ? %3D First, calculate the number of moles of BaCl2. n = mol dm-3 dm3 %3D Next, calculate the molar mass, M, of BaCl2 · 2H20 and the mass, m of the sample to be weighed out

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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.