ICSE.X. CHEMISTRY. 5. MOLE CONCEPT AND STOICHIOMETRY

Calculate the molecular mass of ethane.

• 12

• 14

• 24

• 30

Calculate the molecular mass of a hydrocarbon, if its vapour density is 8.

• 8

• 16

• 24

• 32

Which of the following is the empirical formula for benzene?

• CH

• CH2

• CH3

• CH4

Calculate the empirical formula of C2H4O2.

• CH2O

• C2H4O

• CH2O2

• CH2O

What will be the empirical formula of C2H2?

• CH4

• C2H4

• CH

• C4H1

Calculate the empirical formula mass of C2H4.

• 15

• 18

• 21

• 24

Which of the following correctly represents the empirical formula of acetic acid?

• CHO

• C2H4O

• CH2O2

• CH2O

It gives the actual number of atoms of various elements present in one molecule of it:

• Empirical formula

• Molecular formula

• Simpler formula

• None of these

Which of the following specifies the correct relationship between molecular mass and vapour density?

• Molecular Mass = 2 x V.D.

• V.D. = 2 x Molecular mass

• Molecular Mass = V.D. + 2

• Molecular mass = Vapour density

The simplest whole number ratio between the atoms of various elements present in one molecule of it, is its:

• Empirical formula

• Molecular formula

• Simpler formula

• None of these