24 Jun A lunch pack for a hungry student co
A lunch pack for a hungry student consists of 4 sandwiches, 3 cookies, and 1 apple. The ingredients needed to make 24 sandwiches are 2 packages of buns, 3 packages of sandwich meat, and 1 head of lettuce. How many packages of sandwich meat are needed to make 144 lunch packs? The “equations” are: 2 pkg buns + 3 pkg sandwich meat + 1 head of lettuce ® 24 sandwiches 4 sandwiches + 3 cookies + 1 apple ® 1 lunch pack 2. Sulfur tetrafluoride, SF4, is made in a two-step process as shown in the balanced equations below. First, sulfur dichloride is made from sulfur, and then sulfur dichloride reacts with sodium fluoride to give SF4. How many moles of S8 are needed to make 0.600 moles of SF4? S8 + 8 Cl2 ® 8 SCl2 3 SCl2 + 4 NaF ® SF4 + S2Cl2 + 4 NaCl 3. Assume that 1.0631 g of K2Cr2O7 is dissolved in enough water to make 25.00 mL of solution. (a) What is the molarity of K2Cr2O7? (b) What is the molarity of the potassium cation? (c) What is the molarity of the dichromate anion? The molar mass of K2Cr2O7 is 294.185 g/mol. 4. You have a solution of 0.1027 M sodium chloride. (a) How many moles of solute are contained in 38.65 mL of solution? (b) How many grams of solute are contained in 38.65 mL of solution? (c) What volume (in millilitres) of solution is needed to obtain 0.00750 moles of solute? 5. If 40.00 mL of 2.50 M H2SO4 is diluted to 500.00 mL with pure water, what is the molarity of the diluted sulfuric acid? 6. Suppose you need 2.50 L of 1.50 M phosphoric acid, but only the concentrated acid (14.6 M) is available. What volume (in L) of the concentrated acid must you dilute to 2.50 L to obtain 1.50 M phosphoric acid? 7. Citric acid, H3C6H5O7, reacts with potassium hydroxide to produce potassium citrate and water. How many grams of citric acid are required for complete reaction with 20.0 mL of 0.361 M potassium hydroxide? The molar mass of citric acid is 192.125 g/mol. (Hint: start by writing the balanced equation for the reaction.) 8. A solution of sodium hydroxide is standardized against potassium hydrogen phthalate (abbreviated KHP for convenience). The balanced equation is NaOH + KHP ® KNaP + H2O If a sample of pure KHP weighing 0.6606 g requires 36.69 mL of sodium hydroxide for titration, what is the molarity of the sodium hydroxide? The molar mass of KHP is 204.22 g/mol. 9. A mixture contains potassium hydrogen phthalate (KHP) and sodium chloride. If 1.0211 g of the mixture requires 25.07 mL of 0.1062 M NaOH for titration, what is the percentage of KHP in the mixture? The molar mass of KHP is 204.22 g/mol. CHEM 1P00 Assignment 9. Stoichiometry; Titrations 10. A solution of isopropyl alcohol in water contains 10.0 % by mass of isopropyl alcohol (molar mass = 60.09 g/mol). The density of this solution is 0.9816 g/mL. What is the molarity of isopropyl alcohol?
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