How many grams of carbon atoms are present in a sample of C4H8 if there are 5.70 moles of hydrogen atoms in the sample?

Additional Information:

If needed, use the periodic chart values from the printable Periodic chart provided with this course.
If needed use 6.022 x 1023 for Avogadro's number.
Format your answer:

Using scientific notation
With three significant figures
Include the correct unit abbreviation.