$X \ g$ of benzoic acid on reaction with aqueous $NaHCO_3$ releases $CO_2$ that occupies $11.2 \ L$ volume at $STP$. The value of $X$ is . . . . . . $g$.

The number of molecules of $CO_2$ liberated by the complete combustion of $0.1 \ mol$ of graphite in air is

The phosphate of a metal has the formula $MHPO_4$. The formula of its chloride would be

Calculate the amount of water $(g)$ produced by the combustion of $16 \ g$ of methane. (in $g$)

$20 \ g$ of iron pyrite,$FeS_2$,is roasted completely and the $SO_2$ gas produced is absorbed completely in $400 \ mL$ of $NaOH$ solution. If only $50\%$ of the $NaOH$ is used in the reaction,what was the molarity of the $NaOH$ solution?

$28 \ g$ $KOH$ is required to completely neutralize $CO_2$ produced on heating $60 \ g$ of impure $CaCO_3$. The percentage purity of $CaCO_3$ is approximately (molar masses of $KOH$ and $CaCO_3$ are $56$ and $100 \ g \ mol^{-1}$, respectively).