In a copper sulfate solution,$3.2 \ g$ of copper is displaced by $2.8 \ g$ of iron. If the equivalent mass of iron is $28$,what is the equivalent mass of copper?

When the weights of two elements combine with each other,their ratio is the ratio of their ......

What is the mass in gram of $1$ atom of an element if its atomic mass is $10 \ u$?

Consider the following data:

Element	Atomic mass
$A$	$12.01$
$B$	$35.5$

$A$ and $B$ combine to form a new substance $X$. If $4 \ mol$ of $B$ combine with $1 \ mol$ of $A$ to give $1 \ mol$ of $X$,then the weight of one mole of $X$ is ........... $g$.

$0.16 \ g$ of dibasic acid required $25 \ mL$ of decinormal $NaOH$ solution for complete neutralization. The molecular weight of the acid will be:

What is the average atomic mass of chlorine if its two isotopes $^{35}Cl$ and $^{37}Cl$ exist in a relative abundance of $75\%$ and $25\%$ respectively?