Question

A student has a 10.0g sample of CaBr2. Show the setup of the calculation to determine the number of moles of CaBr2 in the sample. Include units in the setup. (You do not need to do any calculations.)A different student is given a 10.0g sample labeled CaBr2 that may contain an inert (nonreacting) impurity. Identify a quantity from the results of laboratory analysis that the student could use to determine whether the sample was pure.

Answer 1

According to the given question statement, the student need to use the molecular mass of CaBr2. The molecular mass of this compound is 199.88g/mol.

`10.0gCaBr_2\cdot(1molCaBr_2)/(199.88gCaBr_2)`

That is the setup of the calculation.