__________________ is the number of times one molecule of the substance is havier than 1/12 the mass of an atom of carbon \[(C^{12}\)].

Atoms and molecules are too small to be weighed. Their masses are expressed as relative masses. On atomic mass scales, by taking the mass of C-12 atom as 12 atomic mass units. The terms used to express relative masses of atoms, molecules and ions are respectively atomic mass, molecular mass, and formula unit mass

Answer the following questions after reading this passage.

(1) Write the value of the ratio,$\frac{AveragemassofOatom}{1/12xMassofC-12atom}$

(2) How many times a molecule of glucose heavier than 1/12th of the mass of a C-12 atom

(3) What is the formula mass of sodium carbonate?

(a) 84 u (b) 106 u (c) 106 g (d) 84 g

(4) Which of the following substances has a molecular mass of 30 u?

(a) Carbon monoxide (b) Carbon dioxide (c) Ammonia (d) Ethane

Define or explain the terms:
(a) Vapour density,

(b) Molar volume,
(c) relative atomic mass,

(d) relative molecular mass,
(e) Avogadro's number,

(f) Gram atom,
(g) Mole.

If we consider the mass of carbon atom is taken for the relative atomic mass unit as $\frac{1}{6}$, in place of $\frac{1}{12}$ , the mass of one mole of a substance will

Is molecular mass , atomic mass , gram molecular mass, gram atomic mass one mole.

(Like, is 12amu C one mole particles)