Molecules. Moles, Pereent Composition and Chemical Equations 25 Total Points 1. ( 2 point each, 10 points total) For each of the below a. Fo 3 significant figures, how many moles are there is 80 grams of Mercury? b. How muny atoms of Mercury are there in the moles of Mercury above if we use 6.022 figares? c. How many grams of mono-atomic flworine are there in 1,75 moles? d. How many grams are thene in 25.02 mols of watcr? c. Whicls weighs more and by bow much - 2.05 moles of carbon or 2.50 moles of 13 merylium? 2. (4 point) Wowt It has been estimated that there are as many stars in the observable universe as there are molecules of H2O in 10 drops of water. If a drop of water weighs 0.050 grams how many stars are there in our observable universe? 3. ( 6 points) On the distant planet "NoHelpfromiTheWeb" a popular spice with molecular weight 214.22g/mol is made up of four elements unknown on earth: A,D,F and G. The atomic masses and % composition of A,D,F and G in the compound are given below: What is the molecular formula of the spice in terms of A,D,F and G ? 4. (3 points) The active ingredient in alcoholic drinks is ethanol with molecular formula C2H6O. What is the percent carbon in ethanol? ( 2 points) In your own words, explain why the elements of Group 8A are called Noble Gases