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11. You want to make pancakes and see the following table on the box of pancake mix: Fancakes Amount el mix Water 7 2 cups 1 %cup 14 4cups 3 : 21 6cups 5 K tups From this table, what theratio of mixto water for each amount of pancakes? 12. You want to make pancakes and see the following table on the box of pancake mix: Pancakes Amount mix Water 7 cups %cup 14 cups 3 1/2 cups 21 6 cups 5 % cups You want to make 10 pancakes. How much mix and water do you need? 13. You want tomake pancakes and see the following tableonthe box of pancake mix: Fancakes Amount mix Water 7 cups 1 % cup 14 cups 3 Y cups 21 6cups 5 % cups You want to make 50 pancakes. How muchmix and water do you need? 14 recipe for sugar cookies calls for cups of flour, teaspoon baking powder teaspoons of salt, and cup of margarine. This makes 48 servings Convert this recipe intoone that would make 36 servings 15. A reci ipe for chocolate truffles calls for Sounces of cream cheese, 2.5 cups of confectioner'. sugar, 3.5 cups of chocolate chips, and teaspoons vanilla. This makes 60 servings Convert this recipe into one that would make 100 servings. 16. The resistance of solution of copper sulfate is measuredat 0.51 ohms when two electrodes are 4.00cm apart. If resistance directly proportional tothe distance between electrodes, what the distance between the electrodes ifthe resistance is ohms? 17. Rust an iron oxide formed when iron reacts with oxygen present in the air. Inthis compound, there 3:2 ratio of oxygen atoms toiron atorns. If 6,561 atoms of oxygen are present in sample of rust, how many iron atoms does the sample contain? 18. Butane, GH10 used as lighter fuel, contains carbon and hydrogen ina :10 ratio. If a sample contains 8, 750 atoms of hydrogen, how many carbor atoms does the sample contain? 19. Rust an iron oxide formed when iron reacts with oxygen present in the air. In this compound, thereisa 3:2 ratio of oxygen atoms to iron atoms. If 200 atoms are present in: sample of rust, how many oxygen atoms does the sample contain? 20. The compound bromine trifluoride, BrF2, consists of bromine and fluorine ina 1:3 ratio. How many bromine atorns are present ina sample containing 3,344 atoms? 21. What 42% of 340 grams? 22. Whatis 12.5% of 94.2 milligrams? 23. 12 is what percent of 50 kilograms? 24. 30is what percent of 84 grams? 25. What is 180.2 grams after being decreased by 25%? 26. What is 220 milligrams after being increased by 33%? 27. A lecture section of General Chemistry has 90 students: 26 are freshmen, 35 are sophomores, and the rest are juniors. What percentage of the students are sophomores? 28. Alecture section of General Chemistry IIhas 90students: 26 are freshmen, 35 are sophomores, and the rest are juniors. What percentage of the students are freshmen? 29. An automotive company produces cars and trucks. If 19,5% of the production of vehicles is cars, and there were 208, 122 cars produced ir a year, how many vehicles were produced that year? 30. A lecture section of General Chemistry has 90students: 26 are freshmen, 35 are sophomores, and the rest are juniors. What percentage of the students arejuniors? 31. In 159 609 grams (1 mole) of copper sulfate, there are 63 546 grams of copper, 32.06 grams of sulfur, and the resti oxygen. What percent of copper sulfateiscopper? 32. In 159.609 grams (1 mole) of copper sulfate, there are 63.546grams of copper, 32.06 grams of sulfur, and the restis oxygen. What percent of copper sulfateis sulfur? 33. In 159. 609 grams (1 mole) of copper sulfate, there are 63 546 grams of copper, 32.06grams of sulfur, and the rest soxygen. What percent of copper sulfate is oxygen? 34. metal alloy contains 18% iron, 32% nickel, 30% tungsten, and the rest copper. How many grams of copper are contained in88.23 grams of the alloy?

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