Which postulate of Dalton's atomic theory can explain the law of definite proportions?

  • A
    Atoms are indivisible particles.
  • B
    The relative number and kinds of atoms are constant in a given compound.
  • C
    Atoms of a given element have identical mass and chemical properties.
  • D
    Atoms can neither be created nor destroyed in a chemical reaction.

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Calculate the molar mass of the following substances.
$(a)$ Phosphorus molecule,$P_4$ (Atomic mass of phosphorus $= 31$)
$(b)$ Hydrochloric acid,$HCl$
$(c)$ Nitric acid,$HNO_3$

Write down the chemical formulae of:
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$(iii)$ Sodium sulphide
$(iv)$ Magnesium hydroxide

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