Oxygen contains 90% O16 and 10% O18. Its atomic mass is

(1) 17.4

(2) 16.2

(3) 16.5

(4) 17

Subtopic:  Moles, Atoms & Electrons |
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KClO3 on heating decomposes to KCl and O2. The volume of O2 at STP liberated by 0.1 mole KClO3 is

1. 4.36 L

2. 3.36 L

3. 2.36 L

4. None of these

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At S.T.P. the density of CCl4 vapour in g/L will be nearest to [CBSE PMT 1988]

(1) 6.84

(2) 3.42

(3) 10.26

(4) 4.57

Subtopic:  Moles, Atoms & Electrons |
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4.4 g of an unknown gas occupies 2.24 litres of volume at NTP. The gas may be: 

1. Carbon dioxide 2. Carbon monoxide
3. Oxygen 4. Sulphur dioxide
Subtopic:  Moles, Atoms & Electrons |
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The mass of carbon present in 0.5 mole of K4[Fe(CN)6] is

(1) 1.8 g

(2) 18 g

(3) 3.6 g

(4) 36 g

Subtopic:  Moles, Atoms & Electrons |
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The number of moles of oxygen in one litre of air containing 21% oxygen by volume under standard conditions is [CBSE PMT 1995]

(1) 0.186 mole

(2) 0.21 mole

(3) 0.0093 mole

(4) 2.10 mole

Subtopic:  Moles, Atoms & Electrons |
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The empirical formula of an organic compound containing carbon and hydrogen is CH2. The mass of one litre of this organic gas at STP  is exactly equal to that of one litre of N2 STP.Therefore, the molecular formula of the organic gas is

1. C2H4

2. C3H6

3. C6H12

4. C4H8

Subtopic:  Moles, Atoms & Electrons | Empirical & Molecular Formula |
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An organic compound containing C, H and N gave the following on analysis: C = 40%, H = 13.3% and N = 46.67%. Its empirical formula would be

 

(1) CHN

(2) C2H2N

(3) CH4N

(4) C2H7N

Subtopic:  Empirical & Molecular Formula |
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At standard temperature and pressure (STP), the volume of oxygen required to completely combust 30 ml of acetylene under similar conditions is:

1. 100 ml

2. 75 ml

3. 50 ml

4. 25 ml

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If the Avogadro number NA, is changed from 6.022 x 1023 mol-1 to 6.022 x 1020 mol-1 this would change: 

1. The definition of mass in units of grams.

2. The mass of one mole of carbon.

3. The ratio of chemical species to each other in a balanced equation.

4. The ratio of elements to each other in a compound.

Subtopic:  Moles, Atoms & Electrons |
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