Question

how many molecules are contained in .0381g of CO₂?

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Answer 1

number of molecules present = moles x avogadro's number

moles of CO2 = 0.0381 g/44.01 g/mol

                       = 8.66 x 10^-4 mol

molecles of CO2 present = 8.66 x 10^-4 x 6.023 x 10^23

                                         = 5.21 x 10^20 molecules