Answer:
Explanation:
β decay is a process in which a nucleus emits an electron.
The nuclear symbol for a β particle is
l
0
-1
e
.
In any nuclear equation, the sum of the subscripts (atomic numbers,
Z
) and the sum of the superscripts (atomic masses,
M
) must be equal on each side of the equation.
For the β decay of iodine 131, we have
131
53
I
→
l
M
Z
X
+
l
0
-1
e
Hence
131
=
M
+
0
, so
M
=
131
53
=
Z - 1
, so
Z
=
53
+
1
=
54
The element
X
with
Z = 54
is
Xe
.
So the equation is
131
53
I
→
131
54
Xe
+
l
0
-1
e
Note that in β decay, the product has the same mass number but an atomic number that has increased by 1.
Option A is incorrect because phenol exists in liquid state at room temperature and its boiling point is 181 °C.
Option B is incorrect because there is no ether linkage in phenol. Its chemical formula is Ph-OH.
Option C is correct. As the chemical formula cited above contains hydroxyl group (i.e. -OH).
Option D can be considered incorrect because only one derivative of phenol (<span>Guaiacol</span>)is used as flavoring agent in whisky.
<span>Avogadro's constant/number is 6.022 Ă— 10^23 molecules for every 1 mole of substance.
And reaction produces 0.875 moles of h2o.
So,
Number of molecules produced = Avagardo's number x Number of moles of h2o produced.
Number of molecules produced = (6.022 Ă— 10^23) x (0.875)
Number of molecules produced =5.26925 Ă—10^23 molecules.</span>