10g of which of the following substances contains the greatest number of atoms?

Two elements P and Q react to form compounds with formulas $PQ_2$ and $P_2Q$. If 0.1 mole of $PQ_2$ weighs 5 g and 0.2 mole of $P_2Q$ weighs 14 g, what are the atomic masses of P and Q?

In the Haber process, if 40 moles of ammonia are formed, the number of moles of hydrogen consumed is?

What is the mass of 0.2 moles of oxygen atoms?

Which of the following contains the maximum number of water molecules?

The number of molecules present in 1 mL of gas or vapour at STP is:

A mixture of $CO_2$ and $N_2$ gases contains 0.44 g of $CO_2$ and 0.56 g of $N_2$. The total number of moles of gases in the mixture is:

13.5 g aluminium changes to ${\rm{A}}{{\rm{l}}^{3 + }}ion$ in solution by losing :

If you have samples of 0.5 moles of water, 36 g of water, and 3.011 x 10²³ molecules of water, which sample has the greatest mass?

$S{O_2}\,\, + \,\,2\,\,{H_2}S\,\, o \,\,3S\,\, + 2\,\,{H_2}O$ 2 mol of ${H_2}S$ and 11.2 L $S{O_2}$ at NTP react to form $imes$ mol at sulphur, then $imes$ is

$26\,{\rm{mL}}$ of ${\rm{C}}{{\rm{O}}_2}$ are passed over hot coke. The maximum volume of CO formed is :