Atoms and Molec...

The number of gold atoms in 300 mg of a gold ring of 20-carat gold ($$Au = 197$$: pure gold is 24 carat) is:

In a chemical scale, the relative mass of the isotopic mixture of oxygen atoms $$ (^{16}O,^{17}O,^{18}O) $$ is assumed to be equal to 

How many molecules are present in one gram of hydrogen ($$H_2$$)?

If we assume $$\dfrac {1}{6}th$$ part instead  of $$\dfrac {1}{12}th$$ part of weight of $$^{12}C$$ as on amu. The molecular mass of water will be

How many moles of bromine water will be required to complete bromination of 6 moles of phenol?

$$25\ g$$ of $$M{Cl}_{4}$$ contains $$0.5$$ mole chlorine then its molecular weight is:

Two gaseous samples of the same compound were analyzed. One contained 1.2 g of carbon and 3.2 g of oxygen. The other contained 27.3% carbon and 72.7% of oxygen. The experimental data follows:

Zinc sulphate contains 22.65% $$Zn$$ and 43.9% $${H}_{2}O$$. If the law of constant proportions is true, then the mass of zinc required to give 40 g crystal will be:

The weight of one molecule of a compound $$C_{60}$$$$H_{122}$$ is ?

Of two oxides of iron, the first contained $$22$$% and the second contained $$30$$% of oxygen by weight. The ratio of weights of iron in the two oxides that combine with the same weight of oxygen is