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 4.505×1023 4 point 5 0 5 times 10 to the 23th power 6.022×1023 6 point 0 2 2 times 10 to the 23th power 1.024×1023 1 point 0 2 4 times 10 to the 23th power 2.326×1023

Answer 1

To find the number of molecules of carbon dioxide in a 17-gram sample, we first need to calculate the number of moles of carbon dioxide in the sample.

The molar mass of carbon dioxide (CO2) is 12.01 g/mol (carbon) + 2(16.00 g/mol) (oxygen) = 44.01 g/mol.

So, the number of moles of CO2 in a 17-gram sample is:
17 g / 44.01 g/mol = 0.386 moles

Now, to find the number of molecules, we use Avogadro's number, which is 6.022 × 10^23 molecules/mol.

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.