2. While having fun in Chemistry class, you get thirsty. You go down to the “good drinking fountain” (think BB Basement) to have a drink. You drink for a full minute. How many molecules of water did you just drink? What was the mass of this water? Experiment Process Step one: Take two 100 mL beakers and weigh both on a scale. Record the weight of both beakers. Step two: Take both 100 mL beakers and a timer to the water fountain at the bottom of Bishop Brown. Step three: Place one beaker underneath the water fountain and fill it up with water for exactly ten seconds. Step four: Then place the second beaker underneath someone drinking from the fountain and let the person drink for 10 seconds and let the beaker catch the excess water that the person did not drink. Step five: Go back to the classroom and weigh each beaker separately. Record the weight of the beaker with water for a full 10 seconds and then record the weight , then record the weight of the beaker with the excess water not drunk. Step five: Calculate the weight of the water that was recorded for a full 10 seconds without the beaker. Subtract the weight of the 100mL beaker by the weight of the total weight of the beaker and water beaker and that will give you just the weight of the water. Then calculate the weight of the excess water not drunk with out the beaker. Subtract the weight of the 100 mL by the total weight of the beaker and the excess water. That will give you the weight of just the excess not drunk water. Step six: Calculate weight of water for One minute. Take the weight of the water for a constant 10 seconds with out the beaker and multiply it by six. Calculate the weight of the excess water for a whole minute. Take the weight of the excess water not drunk and multiply by six. Step Seven: Calculate how much water was actually drunk for a full minute. Take the calculation of the excess water not for a full minute and subtract it by water for a full minute. Step eight: Calculate how many molecules are in the how ever many grams you have. To calculate you must go from Grams to moles then to molecules.
21. Divide how many blades of grass by 6cm to get how many blades per square inch
22.
23. Again you are thirsty, so you buy a bottle of water from the machine. How much did each molecule of water just cost you? How many water bottles would you have to purchase to consume one mole of water? How much would it cost you to consume One mole of water? Experimental Process: Step one: First get cash and go get a water bottle from the vending machine. Step two: Take a 1000 mL beaker and weigh it in grams. Pour the contents of the water bottle into the beaker and weigh it in grams. Step three: Convert the grams to moles to molecules
25. Calculations Continued One bottle of water: $1.00 Weight of water from the bottle 17.065 oz You would only need to buy one water bottle to have one mole of molecules of water 6.022 x 10^23/ 1.61691 x 10^25 = 0.037 It would cost you 4 cents for one mole of mlc of water 1.00/ 1.61691 x 10^25= 6.18 x 10^ -26 You paid 6.18 x 10^-26 for one molecule!
