16 of 2316 of 23 Items Question Use the table of molar masses to answer the question. Element Molar Mass (g/mol) carbon 12.01 oxygen 16.00 How many molecules of carbon dioxide (CO2 ) are there in a 17-gram sample? (1 point) Responses 6.022×1023 6 point 0 2 2 times 10 to the 23th power 2.326×1023 2 point 3 2 6 times 10 to the 23th power 1.024×1023 1 point 0 2 4 times 10 to the 23th power 4.505×1023
To find the number of molecules of carbon dioxide in a 17-gram sample, first calculate the number of moles of carbon dioxide in the sample:
Molar mass of CO2 = 12.01 g/mol (carbon) + 2(16.00 g/mol) (oxygen) = 44.01 g/mol
Number of moles of CO2 = 17 g / 44.01 g/mol = 0.386 moles
Now, use Avogadro's number to convert moles to molecules:
Number of molecules = 0.386 moles * 6.022 × 10^23 molecules/mol = 2.326 × 10^23 molecules
Therefore, there are 2.326×10^23 molecules of carbon dioxide in a 17-gram sample.