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?

An element has two main isotopes of mass numbers $85$ and $87$. In nature,they occur in the ratio of $75\%$ and $25\%$ respectively. The atomic weight of the element will be approximately:

What is the mass of one molecule of the compound $C_{60}H_{122}$ in grams?

Calculate the molecular mass of glucose $[C_{6}H_{12}O_{6}]$ molecule. (in $u$)

In chlorine gas,the ratio of $Cl^{35}$ and $Cl^{37}$ is

If $A_1 \ g$ of an element gives $A_2 \ g$ of its oxide,then the equivalent mass of the element is .....