Answer Question 5 only After much time, a student has the following data for the

Question

Answer Question 5 only

After much time, a student has the following data for the BaCi_2 + KCI lab: Constant mass of dry weighing bottle Mass of hydrated sample Constant mass of dried sample Use these atomic weights (in grams/mol) from Harris 9e. What chemical species are present in sample b)? What chemical species are present in sample c)? When reporting % masses, which sample should be used in the denominator. Calculate the number of grams of H_2O in the sample b. Calculate the number of moles of BaCi_2 middot 2H_2O in sample b.

Explanation / Answer

5.

sample b is having the weight 13.5790 grams

formula for th eno of moles is

moles = weight / molar mass

weight = 13.5790 g

molar mass of BaCl2·2H2O is 244.26 g/mol

moles of BaCl2 ·2H2O = 13.5790 g / 244.26 g/mol

= 0.0556 mol

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