The gases hydrogen, oxygen, carbon dioxide, sulphur dioxide and chlorine are arranged in order of their increasing relative molecular masses. Given 8 g of each gas at STP, which gas will contain the least number of molecules and which gas the most?

Open in App

Solution

Moles = $\frac{g i v e n m a s s}{m o l e c u l a r m a s s}$
Moles of hydrogen = $\frac{8}{2}$ | molar mass of hydrogen = 2 g
Moles of oxygen = $\frac{8}{32}$ | molar mass of oxygen = 32 g
Moles of carbon dioxide = $\frac{8}{44}$ | molar mass of carbon dioxide = 44 g
Moles of sulphur dioxide = $\frac{8}{96}$ | molar mas of sulphur dioxide = 96 g
Moles of chlorine = $\frac{8}{35.5}$ | molar mass of chlorine = 35.5 g
Molecules are directly proportion to the number of moles of the compound.
As the given mass is same for every gas, moles are inversely proportional to the molar mass.
Thus,
Sulphur dioxide contain least number of molecule because it has highest molar mass and hydrogen contain maximum number of molecule because it has least molar mass.

Suggest Corrections

Similar questions

The gases hydrogen, oxygen, carbon dioxide, sulphur dioxide, and chlorine are arranged in their respective relative molecular mass. Given 8g of each gas at STP, which gas will contain the least number of the molecule and which the most?

(a) What volume of oxygen is required to burn completely a mixture of 22.4 dm³of methane and 11.2 dm³ of hydrogen into carbon dioxide and steam? Equations of the reactions are given below:
CH₄ + 2O₂ $\overset{}{\to}$ CO₂ + 2H₂O
2H₂ + O₂ $\overset{}{\to}$ 2H₂O
(Assume that all volumes are measured at STP)

(b) The gases hydrogen, oxygen, carbon dioxide, sulphur dioxide and chlorine are arranged in order of their increasing relative molecular mass. Given 8 g of each gas at STP, which gas will contain the least number of molecules and which gas the most?

Q. The order of increasing relative molecular mass of the following gases is, hydrogen, oxygen, carbondioxide, sulphurdioxide, chlorine. Given 8 gram of each gas at STP, which will contain the least number of molecules and which the most?

Under the same conditions of temperature and pressure you collect 2 litres of carbon dioxide, 3 litres of chlorine, 5 litres of hydrogen, 4 litres of nitrogen and 1 litre of sulphur dioxide. In which gas sample will there be:
(a) The greatest number of molecules.
(b) The least number of molecules.
Justify your answer.

Q. How many grams of oxygen gas contains the same number of molecules as 16g of sulphur dioxide gas. (Oxygen-16u,Sulphur-32)

Join BYJU'S Learning Program