Answer:
Q1) 0,1276 M
Molair mass of NaOCl = 74,44 g/mol
You have 9,5 g/L.
You need to calculate with the molar mass, how many moles 9,5 g are:
9,5 g / 74,44 g/mol = 0,1276 molAR
0,1276 mol / 1 L = 0,1276 M
Q2) 27.78 grams
The mass ca(Oh)2 needed to produce 1.5 l of 0.25 solution is calculated as follows
find moles
=moles = molarity x volume
moles is therefore = 1.5 x 0.25 = 0.375 moles
mass = moles x molar mass
0.375mol x 74.09 g/mol = 27.78 grams
Explanation:
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