3.1: Quiz 1
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1) Consider the combustion of a candle (C25H52) with oxygen (O2) to form carbon dioxide (CO2) and water (H2O). A typical candle has 100 g of C25H52. Please answer the following questions:
a) (2 pts) Write the balanced reaction for the combustion of a candle (2 points).
b) (2 pts) You are in a closed room with a mole of O2 molecules. If you light 5 candles, what will be the limiting reagent and how much excess (in grams) of either the O2 or C25H52 will remain?
2) Your student ID is made of a plastic called polyvinyl chloride. The molecular unit in this material is C2H3Cl, and for this question you can assume the card is made of only this molecule, with a density of 1.4grams/cm3. Please answer the following questions:
a) (1 pt) Use your 3.091 ruler to determine the mass of your student ID card in grams (assume a thickness of 2 mm and that the card is perfectly rectangular).
b) (2 pts) How many moles of C2H3Cl are in the ID card?
c) (2 pts) There are only 2 stable isotopes of chlorine, 35Cl and 37Cl. What is their relative abundance?
d) (1 pt) You take all the chlorine out of your card and us it to disinfect a 100,000-gallon swimming pool which requires 1 kg of Cl. How many ID cards do you need to disinfect the pool?