A) molar mass of sodium thiosulphate
B) the average of molar masses of \[\text{N}{{\text{a}}_{\text{2}}}{{\text{S}}_{\text{2}}}{{\text{O}}_{\text{3}}}\] and 12
C) half the molar mass of sodium thiosulphate
D) molar mass of sodium thiosulphate \[\times \,\text{2}\]
Correct Answer: A
Solution :
\[2N{{a}_{2}}{{\overset{+2}{\mathop{S}}\,}_{2}}{{O}_{3}}+{{I}_{2}}\xrightarrow{{}}N{{a}_{2}}\overset{+2.5}{\mathop{{{S}_{4}}}}\,{{O}_{6}}+2NaI\] \[n-\]factor \[=1\] \[E=\frac{M}{1}=M\]
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