[" 8.Name the unit in which the radius of an atom is usually everessed "],[" 9.Define "molecular mass' of a substance."],[" 10.What is meantby saying that "the - colccula "]

Name the unit in which the radius of an atom is usually expressed.

(a) What is meant by the 'molar mass' of a substance ? State the unit in which molar mass is usually expressed. Calculate the molar masses of the following substances. Write the result with proper units. (i) Ozone molecule, O_(3) , (ii) Ethanoic acid, CH_(3)COCH

Which is used as the standard for comparing the atomic and molecular masses of substances?

(a) Define atomic mass unit. What is its symbol ? (b) Define atomic mass of an element. (c ) What is meant by saying that 'the atomic mass of oxygen is 16 ' ?

The absolute mass of one molecule of a substance is 5.32 (10*-32) g . What is its molecular mass .