In the transformation $FeC_2O_4 \rightarrow Fe^{3+} + CO_2$,the equivalent weight of $FeC_2O_4$ is $M/n$. The value of $n$ is:

The mass of one molecule of the compound $C_6H_{12}O_6$ is .........

$A$ metal oxide contains $32\%$ oxygen by mass. Its equivalent mass is:

Write about atomic mass.

Boron has two stable isotopes,$^{10}B$ $(19\%)$ and $^{11}B$ $(81\%)$. What will be its atomic mass in the periodic table?

Chlorine has two naturally occurring isotopes,${}^{35}Cl$ and ${}^{37}Cl$. If the atomic mass of $Cl$ is $35.45$,the ratio of natural abundance of ${}^{35}Cl$ and ${}^{37}Cl$ is closest to (in $: 1$)