If you burned 6.10 x 10^24 molecules of ethane (C2H6) what mass of ethane did you burn? (I just need a solid explanation of how to do these, I have a test in a couple hours and I’m in panic)

Beth divided 9 ounces of her granola recipe into 4 equal-sized amounts. she placed the amounts into individual bowls. the fraction 9/4 represents the number of ounces of granola in each bowl. which other number represents the amount of granola beth has in each bowl? (a) 1 1/4 (b) 2 1/4 (c) 1 3/4 (d) 3 3/4 i need !