The heat of fusion for water is the amount of energy that must be absorbed for water to _____.
1 answer:
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Answer:
The answer to your question is Molarity = 0.0708
Explanation:
Data
NaOH 0.05 M Volume 1 = 3.87 ml Volume 2 = 25.11 ml
HCl 15 ml
Process
1.- Find the volume used of NaOH
25.11 - 3.87 = 21.24 ml = 0.02124 l
2.- Write the balanced equation of the reaction
NaOH + HCl ⇒ NaCl + H₂O
3.- Calculate the moles of NaOH in the solution
Molarity =
moles = Molarity x volume
moles = 0.05 x 0.02124
moles = 0.001062
4.- From the reaction we know that NaOH and HCl react in a proportion 1:1.
1 mol of NaOH ------------- 1 mol of HCl
0.001062 moles of NaOH ------------ x
x = (0.001062 x 1) / 1
x = 0.001062 moles of HCl
5.- Find the molarity of HCl
Molarity =
Molarity = 0.0708
Answer:
The correct answer is option d.
Explanation:
..[1]
..[2]
moles of sodium thiosulfate solution = n
Molarity of the sodium thiosulfate solution = 0.150 M
Volume of sodium thiosulfate solution used = 0.890 mL = 0.00089 L
According to reaction [2], 2 moles of sodium thiosulfate reacts with 1 mol .
Then , 0.0001335 mol of sodium thiosulfate will reacts with:
of
Moles of = 0.00006675 mol
According to reaction [1], 1 mol of is obatnied from 1 mol of NaClO.
Then 0.00006675 mol of will be obtained from:
Mass of 0.00006675 mol of NaClO=
0.00006675 mol × 74.44 g/mol = 0.00496887 g
Mass of sample = 0.0854 g
Percentage of NaClO in sample: