Question

Five grams of each of the following gases at 87oC and 750 mm pressure are taken. Which of them will have the least volume?

Solution

Correct option is

Hl

5 g HF = 5/20 mol, 5 g HCl = 5/36.5 mol, 5 g HBr = 5/81 mol, 5 g HI=5/121 mol. Thus HI has least no. of moles and hence least volume.

SIMILAR QUESTIONS

Q1

The formula weight of an acid is 82.0 in a titration 100 cm3 of a solution of this acid containing 39.0 g of the acid per litre were completelyneutralised by 95.0 cm3 of aqueous NaOH containing 40 .0 g of NaOHper litre. What is the basicity of the acid?

Q2

An analysis of a pyrex glass showed 12.9% B2O3, 2.2% Al2O3, 3.8% Na2O, 0.4% K2O and remaining is SiO2. What is the ratio of Si to B atoms in the glass?

Q3

One litre of a gas is at a pressure of 10–6 mm of Hg at 25oC. How many molecules are present in the vessel?

Q4

27 g of Al (at mass = 27) will react with oxygen equal to

Q5

2.76 g of silver carbonate (at mass of Ag = 108) on being heated strongly yields a residue weighing 

Q6

If 0.5 mol of BaCl2 is mixed with 0.2 mol of Na3PO4, the maximum number of moles of Ba3(PO4)2 that can be formed is

Q7

If 1021 molecules are removed from 200 mg of CO2, then the number of moles of CO2 left are

Q8

The  number of gram molecules of oxygen in  molecules is

Q9

The molecular weight of O2 and SO2 are 32 and 64 respectively. If onelitre of O2 at 15oC and 750 mm contains N molecules, the number of molecules in two litres of SO2 under the same conditions of temperature and pressure will be

Q10

Haemoglobin contains 0.33% of iron by weight. The molecular weight of haemoglobin is approximately 67200. The number of iron atoms (at wt. of Fe = 56) present in one molecule of haemoglobin is