Question

calculate the number of moles and number of molecules in a sàmple of 60 g of CaCO3. [Molar atomic mass of calcium = 32 g/mol.


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Answer 1

Answer:

0.2 modes

Explanation:

CaCO

3

atomic mass = 40+12+3×16

=100

moles =

atomicmass

gramweight

=

100

20

(given)

=0.2 moles

Answer 2

Answer:

0.6 moles and 3.6×10^23 molecules

Explanation:

number of moles=weight /GMW

=60/100

= 0.6 moles

number of molecules=number of moles×avagadro no.

=0.6×6.023×10^23

=3.6×10^23