Answer: 2.887 grams
To calculate the mass of a given number of molecules, we need to know the molar mass of the substance.
The molar mass of carbon monoxide (CO) is 28.01 grams per mole.
We can set up a conversion factor to calculate the mass of 6.2x10^22 molecules:
1 mole CO = 28.01 grams CO
Using this conversion factor, we can set up the following calculation:
(6.2x10^22 molecules CO) x (1 mole CO / 6.022x10^23 molecules CO) x (28.01 grams CO / 1 mole CO)
Calculating the above expression gives us:
(6.2x10^22 x 1 x 28.01) / (6.022x10^23 x 1)
Simplifying the calculation, we have:
(173.922x10^22) / (6.022x10^23)
= 2.887 grams
Therefore, the mass of 6.2x10^22 molecules of carbon monoxide is approximately 2.887 grams. None of the provided answer choices match this value exactly.