The molarity of pure water is ...... .

In the reaction,$2Al_{(s)} + 6HCl_{(aq)} \rightarrow 2Al^{3+}_{(aq)} + 6Cl^{-}_{(aq)} + 3H_{2(g)}$

$A$ spherical ball of radius $7 \ cm$ contains $56 \ w\%$ iron. Find out the number of moles of iron present approximately in the ball (in $.1$)? $(d = 1.4 \ g \ cm^{-3}; \text{atomic mass} = 56 \ g \ mol^{-1})$

What is the normality of $1.5 \ M \ H_3PO_4$ (in $.5$)?

The reaction of $1 \ mol$ of magnesium nitride with excess water gives:

Calculate the volume of $O_2$ at $STP$ required for the combustion of $1 \, \text{mol}$ of carbon disulfide $(CS_2)$ in $L$.