Question

A- a student has 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)

B- what number in addition to the answer to part A is needed to determine the number of atoms of Ca in the sample?

C-a different student is given a 10.0g sample labeled CaBr2 that may contain an inert (non reacting) impurity, identify a quantity from the results of a laboratory analysis that the student could use to determine whether the sample is pure.

D-explain why CaCl2 is likely to have properties similar to those of CaBr2 ​

Answer 1

Answer:

See explanation

Explanation:

a) number of moles = reacting mass/molar mass

Reacting mass = 10g

Molar mass of CaBr2= 200 g/mol

Number of moles = 10g/200g/mol

b) Avogadro's number = 6.02 × 10^23

c) melting point of the CaBr2

Recall that pure substances have sharp melting points while impure substances melt over a range of temperatures.

d) They are both halide salts of calcium hence they are expected to display similar chemical properties.