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.