Q1. Suppose you dissolve three teaspoons of sugar (about 15 g of sucrose) into a large cup of coffee (20-fl oz ; with a mass of about 600 g) a. What is the total mass of the solution? b. What is the volume of this solution (in liters) if the density is 1050 g per liter? c. How many moles of sucrose were dissolved (molar mass of sucrose = 342 g/mol)? d. Use your answers to parts b and c to determine the molarity of sucrose in this solution Q2. Assuming that rubbing alcohol is 70% (w/w) isopropyl alcohol and that its density is 1 kg/L, a. How many grams of water and how many grams of isopropyl alcohol are there in a liter of rubbing alcohol? b. How many moles of water and how many moles of isopropyl alcohol (molecular weight 60) are there in a liter of rubbing alcohol? c. If we decide which is the solute on the basis of weight, is isopropyl alcohol the solute or the solvent? d. if we decide on the basis of the number of moles, is isopropyl alcohol the solute or the solvent? c. Considering water as the solute and the isopropyl alcohol as the solvent, what is the molarity of the water in the solution? Q3. How many liters of 0.1 M NaOH solution does it take to neutralize (a) 1 liter of 0.1 M HCI? (b) 0.5 liter of 0.2 M HCI? (c)3 liters of 0.01 M HCI? 04. Baking powder, one of several types of leavening agents used in preparing bread, cakes and similar baked goods, causes dough to rise during the baking process by releasing tiny bubbles of gas. This gas is generated through an acidbase neutralization between two components of the baking powder: sodium bicarbonate (NaHCO3), and an acid, such as calcium acid phosphate (CaHPO4). The gas is released as these two chemicals react with each other within the wet dough. (a) What is the name and the chemical formula of the gas released during this reaction? (b) What role does the sodium bicarbonate serve in this process? Q5. Identify a radioisotope with a half-life a. less than one day b. between one day and one year c. between 1000 and 10,000 years d. greater than one billion years You can find half-lives of various isotopes on the Internet. Q6. The half-life of C-14 is 5730 years. This suggests that there is a 50% chance that any particular atom of C-14 will undergo radioactive decay after 5730 years have passed. It also suggests that if you have a sample of exactly four C-14 atoms, two of the four will decay after a period of 5730 years have passed, then only one of the remaining two will decay after another period of 5730 years have passed. Show that these two conclusions are compatible with each other
