Question

Question #23dab

Answer 1

See below.

Explanation:

Step 1: Find the mass of carbon in the compound by using the % composition.

`28*0.78="21.84 grams of C"` (not using sig figs)

Step 2: Use the mass of carbon to convert it to moles.

`"21.84 g C"*(("1 mole C")/("12.011 g"))="1.818 moles of C"`

Step 3: Use the moles to convert to number of atoms using Avogadro's number.

`"1.818 moles C"*((6.022*10^23)/("1 mole C"))=1.095*10^24 "atoms of C"`

I hope this helps!