By which method the molecular mass of benzene was determined as 78.108 ?

Related Mcqs:

1. A compound is determined to have an emperical formula of C2H6O and a molar mass of 138 g/mole. What is the molecular formula?

   A. C2H6O B. C6H18O3 C. C6H12O6 D. C2H5O Submitted by: Muhammad Ali Kunbhar...

2. In benzene sulphonic acid the sulphonic group is attached with benzene ring through ___________________?

   A. Hydrogen B. Oxygen C. Sulphur D. OH...

3. Oxygen (molecular weight = 32) diffuses at a rate of 10cm3/min under the same conditions of temperature and pressure how fast will hydrogen (molecular weight = 2) diffuse ?

   A. 20cm3/min B. 40cm3/min C. 160cm3/min D. 2.5cm3/min...

4. Molecular mass of water (18g) means__________________?

   A. 1-mole molecules of water B. 1-gram molecule of water C. 3-gram atoms D. all...

5. When cationic molecular ions are allowed to pass through strong magnetic field in mass spectrometer which of the following ions is fallen__________________?

   A. lighter B. intermediate C. heavier D. are collected at same time...

6. A substance is analyzed and found to have an emperical formula of CH2 and a molar mass of 56g/mole. What is the molecular formula of the compound?

   A. C2H4 B. C3H6 C. C4H8 D. C5H10 Submitted by: Muhammad Ali Kunbhar...

7. The number of atoms present in 21.6 gram of silver (atomic weight = 108) are same as the molecules in__________?

   A. 1.8 gram of H2O B. 12 moles of KMnO4 C. 0.6N H2SO4 D. 4.6 gram of C2H5OH Submitted by: Muhammad Ali Kunbhar...

8. The molar mass of an organic acids is determined by____________?

   A. Depression of freezing point B. Volumetric method C. Victor Meyer’s method D. Osmosis method Submitted by: Muhammad Ali Kunbhar...

9. Mass spectrometer is used to determine Mass number of isotopes and___________________?

   A. Atomic number B. Relative abundance C. Electronic configuration D. All of the above...

10. A sample of an iron and oxygen ore has a mass of 35.8 grams. The iron in the compound has a mass of 27.9 grams. What is the percent iron in the ore?

    A. 74% Fe B. 75% Fe C. 77% Fe D. 78% Fe Submitted by: Muhammad Ali Kunbhar...