Question

What is the mass of 4.18 x 1020 molecules of carbon monoxide

Answer 1

0.0194 g or 19.4 mg

Step-by-step explanation:

First convert the number of molecules into moles by a conversion factor 6.02 x 10^23 molecules = 1 mol

4.18x10^20 molecules x (1 mol / 6.02x10^23 molecules) = 6.94x10^-4 moles

Then the Molar Mass is 12.01 + 16.00 = 28.01 g / mol

6.94 x 10^-4 moles CO x (28.01 g /mol) = 0.0194 g = 19.4 mg