CHANGE THE SPEECH .
1. The patient said, " Thanks a lot , Doctor ."
2. She said," Alas ! we are ruined."
3. Suresh said," Goodbye, my friends."
4. He wished that he had the wings of a bird .
5. The poor little boy said," If I were a Prince."
6. The wife requested her husband to pardon their son his first mistake.
Answers
Explanation:
ANSWER
Oleum consists of SO
3
and H
2
SO
4
.
Let the mass of SO
3
in the given sample of oleum be =x g
Mass of H
2
SO
4
in the given sample of oleum =(0.5−x)g
Eq. mass of SO
3
=
2
80
=40
No. of g equivalents of SO
3
=
40
x
[2NaOH+SO
3
→Na
2
SO
4
+H
2
O
2NaOH+H
2
SO
4
→Na
2
SO
4
+2H
2
O]
Eq. mass of H
2
SO
4
=
2
98
=49
No. of g equivalents of H
2
SO
4
=
49
(0.5−x)
Total no. of g equivalents =
40
x
+
49
(0.5−x)
26.7 mL of 0.4 N NaOH contain no. of equivalents of NaOH
=
1000
0.4
×26.7
At equivalence point,
No. of g equivalents of NaOH=
40
x
+
49
(0.5−x)
So,
1000
0.4×26.7
=
40×49
49x+(40×0.5−40x)
x=
9
0.9328
=0.1036
Hence, % of free SO
3
=
0.5
0.1036
×100
=20.72%
Answer:
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