What is the mass percent of carbon in $C{O_2}$

Suppose the Avogadro constant was $6.022 imes 10^{18} \, mol^{-1}$. How many atoms would be present in 0.5 moles of helium?

If $4.6$ g of formic acid and $9.0$ g of oxalic acid react with concentrated $H_2SO_4$, and the resulting gaseous mixture is passed through $KOH$ pellets, what mass of gas (in grams) will remain at STP?

Number of molecules in 1 ml of ${O_2}$ at NTP

Suppose the elements X and Y combine to form two compounds $X{Y_2}$ and ${X_3}{Y_2}$. When 0.1 mole of $X{Y_2}$ weights 10 g and 0.05 mole of ${X_3}{Y_2}$ weights 9 g, the atomic weights of X and Y are

In which case the number of molecules of water maximum

The oxidation number and covalency of sulphur in the sulphur molecule $\left( {{S_8}} \right)$ are respectively :

Elements A and B form two compounds $A_2B$ and $A_3B_2$. 0.2 moles of $A_2B$ weighs 20 g, and 0.1 moles of $A_3B_2$ weighs 18 g. Find the atomic weights of A and B.

The Largest number of molecules is in

Calculate the mass (in g) of the gaseous product remaining at STP when a mixture of $9.2$ g formic acid and $18$ g oxalic acid is treated with conc. $H_2SO_4$ and then passed through $KOH$ pellets.

Oxygen and the oxide ion have the