textbook problem 6A.23

[Nathalia Garibay 1D]

Hello,

I'm checking the solution for this problem and I'm not quite understanding how they got the value 171.36 as the denominator for .43/171.36
Any help would be appreciated!

Thanks

[Stella Huang 2C]

Hi! 171.36 is the molar mass for Ba(OH)2. Since they give you the amount of Ba(OH)2 in grams, you have to divide that amount by Ba(OH)2's molar mass (171.36g/mol) to get the amount of Ba(OH)2 in moles to find the molarity.

Hope this helps!