Question

Calculate number of molecules in 5.5g of CO2
(ATOMIC MASS :- C=12,O=16)

Answer 1

there are 6.023 ×10^23 molecules in 44 g of CO2

1 g of CO2 will contain= 6.023×10^23/44 molecules

therefore 5.5 g of CO2 will contain
=6.023×10^23/44×55/10
7.528 ×10^22 molecules

hope this helps

Answer 2

number of molecules = number of moles×avagadro number

so number if moles = given mass /molecular mass
mole= 12.5
number of molecules = 12.5 ×6.022×10×power 23

answer = 75.275×10power23