Question

calculate the number of molecules of carbon dioxide present in 4.4g of carbondioxide

Answer 1

[tex]Number of moles= \frac{Weight in gram}{molecular weight} \\ No. of moles = \frac{4.4}{44} =0.1 moles \\ We, know that 1 mole contains 6.023 X 10 ^{23} molecules \\ So, 0.1 mole contains, 6.023X 10^{23} X 0.1=6.023X10^{22} [/tex] molecules

Answer 2

No. of moles = Given mass/ molar mass 
= 4.4 / 44 = 0.1 moles

no. of molecules or particles = no. of moles x avogadro no.
= 0.1 x 6.023 x  $10^{23}$
= 6.023 x $10^{22}$