tory Take TestB of Stiibene Quiz-Spl8 e Question Completion Status: QUESTION o.5

Question

tory Take TestB of Stiibene Quiz-Spl8 e Question Completion Status: QUESTION o.5 What is the concentration (weight % in water) of concentrated hydrobromic acid? 36% 100% 55% 48% QUESTION9 0. Given the following stoichiometric information for a generic reaction and that B is the limiting reagent, calculate the theoretical yield of F in moles. Reaction2AB E 2F Moles fmo)1500 O1.200 moles O 0.600 mole 0300 mole 2.400 moles QUESTION 10 Click Save and Submit to save and submit. Click Save Al Answers to save all answers. Save All Ans 21

Explanation / Answer

molarity of concentrated HBr is 8.89 mole/L and its density is 1.5 g/ml, 1000ml=1L, density is 1.5*1000 g/L

1L of solution of HBr correspond to 1.5*1000 =1500gm of solution

1500 gm of HBr solution contains 8.89 moles of HBr, molar mass of HBr=81g/mole

mass of HBr in the solution = moles* molar mass = 8.89*81 gm =720.1 gm

% of HBr in the solution = 100* mass of HBr/mass of solution =100*720.1/1500=48% ( D is the answer)

2. since B is the linitinng reagent, it decides the no of moles of F formed. As per the reaction

1 mole of B gives rise to 2 mole of F

0.6 moles of B gives rise to 0.6*2= 1.2 moles of F ( A is correct)

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