INTRODUCTION TO THE TERM- MOLE

Fill in the blank

• 6 g

• 12 g

• 1 g

• 24 g

________ is always the same but mass is different

• Atomic Number

• Avogadro Number

• Element in a compound

• Molecule in a compound

Avogadro Number is discovered by Amedeo Avogadro

• True

• False

Value of Avogadro's constant is:

• 6.033 x 10^23

• 6.022 x 10^22

• 6.028 x 10^23

• 6.022 x 10^23

• 6.02x 10^23 atoms of H

• 4 g atoms of Hydrogen

• 1.81 x 10^23 molecules of CH4

• 3.0 g of carbon

What is the mass of one molecule of water in grams?

• 18

• 16

• 10

• 17

Mass of electron is more than the mass of neutron

• Yes

• No

• Equal

40 g of NaOH is equal to :

• 1 mole

• 30 moles

• 40 moles

• 3.33 moles

Molecular mass of CaO : (Atomic mass of Ca: 40, 0: 16)

• 56 u

• 48 u

• 640 u

• 23 u

Molecular mass of MgCl2 (Molecular mass of Mg: 24, Cl: 35.5)

• 100 u

• 111 u

• 105 u

• 95 u