Assignments - Girish Toofany - Chem121/120 2008-3 Surrey Le...

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Girish Toofany - Chem121/120 2008-3 Surrey Le 1 Assignment 1. Due date: Sat Sep 13 23:59:00 2008 1 point(s) Calculators and ScientiFc Notation Use a calculator to evaluate 6 . 72 × 10 - 19 . You are correct. Your receipt is 167-3577 1 point(s) SigniFcant ±igures in Simple Calculations Evaluate the following expression and express the answer in decimal or scientiFc notation rounded to the correct num- ber of signiFcant Fgures . 2.40 x 1.7 = You are correct. Your receipt is 167-402 1 point(s) Units and SigniFcant ±igures Evaluate the following expression and express the answer in scientiFc notation rounded to the correct number of signiFcant Fgures . Also specify correct units . 0 . 00421 g [0 . 0007840 cm 3 +1 . 19 × 10 - 5 cm 3 ] = You are correct. Your receipt is 167-9908 2 point(s) Dimensional Analysis and Units A Canadian, driving in the U.S.A., fuels their car at a cost of US $ 3.73 per gallon (US) . The current monetary exchange rate is 0.942 US $/ Can $. The density of the fuel is 0.614 g/mL . What is the mass of Can $ 60.00 -worth of this fuel? You are correct. Your receipt is 167-8732 If the vehicle consumes the gasoline at a rate of 7.18 L/100 km , how many miles can it travel on the above amount of gasoline? miles You are correct. Your receipt is 167-1000 1 point(s) Mass–Density–Volume–Displacement Canadian $0.10 and $0.25 coins are made of pure nickel which has a density of 8.902 g/cm 3 . Suppose each dime weighs 2.02 g and each quarter weighs 5.05 g. A small collection of dimes and quarters are submerged in 10.00 mL of water in a graduated cylinder causing the water level to rise to the 17.83 mL mark. What is the combined monetary value (in Can$) of those coins? $ Incorrect. 3 point(s) Molar Mass and Elemental Composition Current convention deFnes 1 amu as exactly 1 12 the mass of an atom of the isotope 12 C. Since most elements occur natu- rally in well-established Fxed relative abundances of di±erent isotopes, the so-called Atomic Mass for a particular element represents a weighted average of the masses of the individual isotopes. ²or example, naturally occuring carbon is a mixture of 98.90% 12 C (12.000000 amu) and 1.10% 13 C (13.003355 amu) plus a trace of 14 C (14.003241 amu). The Atomic Mass of carbon is found to be 12.011 amu. A
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Assignments - Girish Toofany - Chem121/120 2008-3 Surrey Le...

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