Some Basic Concepts of Chemistry · Chemistry · WB JEE

How many oxygen atoms are present in 0.36 g of a drop of water at STP?

Arrange the following in order of increasing mass

I. 1 mole of N$$_2$$

II. 0.5 mole of O$$_3$$

III. $$3.011\times10^{23}$$ molecules of O$$_2$$

IV. 0.5 gram atom of O$$_2$$

63 g of a compound (Mol. Wt. = 126) was dissolved in 500 g distilled water. The density of the resultant solution as 1.126 g/ml. The molarity of the solution is

How much solid oxalic acid (Molecular weight 126) has to be weighed to prepare 100 ml. exactly 0.1 (N) oxalic acid solution in water?

$${C_6}{H_6}(liq) + {{15} \over 2}{O_2}(g) \to 6C{O_2}(g) + 3{H_2}O(liq)$$

Benzene burns in oxygen according to the above equation. What is the volume of oxygen (at STP) needed for complete combustion of 39 gram of liquid benzene?

A metal (M) forms two oxides. The ratio M:O (by weight) in the two oxides are 25:4 and 25:6. The minimum value of atomic mass of M is

1 mL of water has 25 drops. Let N₀ be the Avogadro number. What is the number of molecules present in 1 drop of water ? (Density of water = 1 g/mL)