Question

i) Calculate the molecular weight of the compound present in
marble stone. [Ca = 40, C = 12 and O = 16]
ii) Calculate the percentage composition of hydrogen and
oxygen in water molecule. [H = 1 and O = 16]

Answer 1

Answer:

Correct option is C)

Molecular weight is the mass of whole molecule.

Steps:- (1) Chemical formula of calcium carbonate ⟶CaCO

3

(2) Mass of Calcium⟶40

Mass of Carbon⟶12

Mass of Oxygen⟶16

(3) Multiply mass of each element by number of atoms of that element.

(4) Add all the masses obtained after multiplication.

⟶CaCO

3

=1×40+1×12+3×16

=40+12+48

=100.

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Answer 2

Answer:

it is option c soeit is ct