Atoms and Molec...

A gaseous mixture contains oxygen and nitrogen in the ratio of 1: 8 by mass. Therefore, the ratio of their respective number of molecules is:

If we consider that $\frac{1}{6}$, in place of $\frac{1}{12}$; mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will 

What is the molecular mass of sodium sulphate?

The molecular mass of $K_2CO_3$ is:

The total number of oxygen atoms in $0.2mol$ of ${Na}_{2}{B}_{4}{O}_{7}.10{H}_{2}O$ will be?

Number of electrons in 1.8 mL of ${H}_{2}O$ are:

$10\ { dm }^{ 3 }$ of ${ N }_{ 2 }$ gas and $10\ { dm }^{ 3 }$ of gas X at the same temperature contain the same number of molecules. The gas X is

Avogadro's number of helium atoms have a mass of

If the atomic weight of oxygen were taken as $90$, then what would be the molecular weight of water?

$AB_2$ and $A_2B_2$ are two compounds of the elements A and B. 0.25 mole of each of these compounds weights 9 g and 16 g respectively. Find the atomic masses of A and B.