Home
Class 12
CHEMISTRY
A hydrocarbon contains 10.5 g of carbon ...

A hydrocarbon contains `10.5 g` of carbon per gram of hydrogen. `1 L` of vapour of the hydrocarbon at `127^(@)C` and 1 atm pressure weighs `2.8 g`. Find the molecular formula of the hydrocarbon.

Text Solution

Verified by Experts

The correct Answer is:
`(C_(7)H_(8))`
First we determine empirical formula as

`rArr` Empirical formula `C_(7)H_(8)` , From gas equation: `pV = ((w)/(M)) RT`
`M = (wRT)/(pV0 = (2.8 xx 0.082 xx 400)/(1 xx 1) = 91.84 ~~ 92 :'` Molar mass (M) is same as empirical
formula weight. = Empirical formula `= C_(7)H_(8)`
Promotional Banner

Topper's Solved these Questions

  • STATES OF MATTER

    VMC MODULES ENGLISH|Exercise ILLUSTRATION|30 Videos

  • STATES OF MATTER

    VMC MODULES ENGLISH|Exercise SOLVED EXAMPLES|20 Videos

  • STATES OF MATTER

    VMC MODULES ENGLISH|Exercise JEE-Main ( ARCHIVE )|17 Videos

  • STATES OF MATTER

    VMC MODULES ENGLISH|Exercise IMPECCABLE|50 Videos

  • STOICHIOMETRY - I

    VMC MODULES ENGLISH|Exercise JEE Advanced (Archive)|31 Videos

Similar Questions

Explore conceptually related problems

A hydrocarbon contains 10.5 g of carbon per gram of hydrogen. 1 litre of the vapour of the hydrocarbon at 127°C and 1 atmosphere pressure weighs 2.8g. Find the molecular formula of the hydrocarbon.

A gaseous hydrocarbon has 85% carbon and vapour density of 28. The possible formula of the hydrocarbon will be

1 litre of a hydrocarbon weight as much as one litre of CO_(2) . The molecular formula of hydrocarbon is :-

448 mL of a hydrocarbon, having C = 87.8%, H = 12.19%, weigh 1.64 g at S.T.P Determine the molecular formula of the compound.

0.078 g of a hydrocarbon occupy 22.414 mL of volume at S.T.P. The empirical formula of the hydrocarbon is CH. The molecular formula of hydrocarbon is

A hydrocarbon contains 91.3% carbon by mass. Find the empirical formula of hydrocarbon?

'X' an organic compound - containing “carbon, hydrogen & oxygen only contains, 1.92g. of carbon & 0.48g. of hydrogen. If the compound weighs 3.68g, & has a vapour density of 69, find the molecular formula of the compound. [C=12, H=1, O=16]

A hydrocarbon contains 17.2% H. If the vapour density is 29, calculate its molecular formula.

A sample of a gas at 100^(@)C and 0.80 atm pressure has a density of 1.15 g L^(-1) . What is the molecular weight of the gas?

A pure gas that is 14.3% hydrogen and 85.7% carbon by mass has a density of 2.5g L^(-1) at 0^(@)C and 1 atm pressure. What is the molecular formula of the gas :

VMC MODULES ENGLISH-STATES OF MATTER-JEE-Advanced
  1. 4.215 g a metallic carbonate was heated in a hard glass tube and CO2 e...

    Text Solution

    |

  2. 3.7 g of a gas at 25°C occupies the same volume as 0.184 g of hydrogen...

    Text Solution

    |

  3. A hydrocarbon contains 10.5 g of carbon per gram of hydrogen. 1 L of v...

    Text Solution

    |

  4. The pressure in a bulb dropped from 2000 to 1500 mm Hg in 47 min when ...

    Text Solution

    |

  5. The ratio of root mean square velocity to average velocity of a gas mo...

    Text Solution

    |

  6. Temperature at which gas behave ideally over a wide range of pressure ...

    Text Solution

    |

  7. Calculate the average kinetic energy in joules of the molecules in 8.0...

    Text Solution

    |

  8. Helium atom is two times heavier than a hydrogen molecule. At 289 K, t...

    Text Solution

    |

  9. A gas in a closed container will exert much higher pressure due to gra...

    Text Solution

    |

  10. Give reasons for the following in one or two sentences. (i) Equal vo...

    Text Solution

    |

  11. When 2g of a gas A is introduced into an evacuated flask kept at 25^@C...

    Text Solution

    |

  12. Oxygen is present in a 1 litre flask at a pressure of 7.6 xx 10^(-10) ...

    Text Solution

    |

  13. When an ideal gas undergoes unrestrained expansion, no cooling occurs ...

    Text Solution

    |

  14. Calculate the root mean square velocity of ozone kept in a closed vess...

    Text Solution

    |

  15. The rate of diffusion of a gas is

    Text Solution

    |

  16. Kinetic energy of a molecule is zero at 0^(@)C.T//F

    Text Solution

    |

  17. The rate of diffusion of a gas is………….proportional to both ……….. And s...

    Text Solution

    |

  18. The average speed of ideal gas molecule at 27^@C is 0.3 ms^-1 . Calcul...

    Text Solution

    |

  19. A spherical balloon of 21 cm diameter is to the filled up with H(2) at...

    Text Solution

    |

  20. The value of PV for 5.6 L of an ideal gas is ……… RT at NTP.

    Text Solution

    |