14) 14) How many atoms are in 5.80 moles od He? A) 6.02 x 1023 B) 3.49 x 1024 9103 1023 D) 400 E) none of the above 15 15) How many moles are there in 82.5 grams of iron? A) 148 B) 497 * 1025 C) 55.85 D) 0677 E) none of the above 16) How many grams of calcium chloride are needed to produce 100 g of potassium chloride? D) 0134g 16) A) 29.8 g B) 1498 7448 17) 17) What is the mass percent of carbon in oxalic acid HCO A) 267 B) 34.5 C) 224 D) 13.3 E) none of the above 18) 18) Determine the empirical formula of a compound cotaining 603% magnesium ond 397% e gen A) Mg203 B) Mgo2 E) none of the above 19) 19) What are the coefficients for the following reaction when it is properly balanced? B) 1,3,21 )2322 D) 2, 1, 3,1 E none of the above All of the following compounds are soluble in water EXCEPT D) CaCz B) FeCs C NaCl A-3