How many moles are present in 18g of water (H2O)?

Arrange the following in increasing order of the number of atoms present:

(i) 2 g of He

(ii) 4 g of $H_2$

(iii) 8 g of $O_2$

If you have 2 g of each of the following substances, which one would contain the highest number of atoms?

How many moles of water are present in 22.4 L of water vapor at Standard Temperature and Pressure (STP)?

The total number of electrons in 18 ml of water (density = 1/gml

Which of the following statement is correct

A 0.50 $M$ solution of $KI$ reacts with excess of ${{\rm{H}}_2}{\rm{S}}{{\rm{O}}_4}$ and ${\rm{KI}}{{\rm{O}}_3}$ solutions according to the equation, $6{{\rm{H}}^ + } + 5{{\rm{I}}^ - } + {\rm{IO}}_3^ - o 3{{\rm{I}}_2} + 3{{\rm{H}}_2}{\rm{O}}$. Which of the following statements is true?

If Avogadro number, $N_A$, is changed from $6.022 imes 10^{23} \, mol^{-1}$ to $6.022 imes 10^{20} \, mol^{-1}$, this would change:

Which of the following has the largest number of atoms?

Which gas contains larger number of molecules?

A mixture of $1.2$ g formic acid and $2.25$ g oxalic acid is treated with conc. $H_2SO_4$. The evolved gaseous mixture is passed through $KOH$ pellets. Calculate the mass (in g) of the remaining product at STP.