Basic concepts of chemistry

Calculate the molecular mass of acetone (CH₃COCH₃ )

• 46 g mol^-1

• 64 g mol^-1

• 58 g mol^-1

------- is considered as standard for atomic mass.

• ₆C¹²

• ₇C¹²

• ₆C¹³

1 mole = ?

• 60.23 x 10²³

• 6.23 x 10²³

• 6.023 x 10²³

Volume occupied by 1 mole of any gaseous substance at 273 K and 1 bar pressure is ------

• 22.71 litres

• 22.4 litres

• 24.5 litres

Equivalent mass of a reducing agent = Molar mass of reducing agent / ?

• no.of electrons gained by 1 mole

• no.of electrons lost by 1 mole

What is the molecular formula of Lactic acid ( Empirical formula CH₂O ) if n=3,

• CH₂O

• C₄H₆O₆

• C₃H₆O₃

mass / molar mass = number of moles (n)

• true

• false

n x mass(m) = molar mass

• true

• false

nx molar mass = mass(m)

• true

• false

volume / 22.4 litres = n (no of moles)

• true

• false