In Class Problems Group 1

# In Class Problems Group 1 - CHEMISTRY 1414 Spring 2011...

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CHEMISTRY 1414 Spring 2011 In-Class Problems Group 1 1A). Average Atomic Mass 1) . Calculate the average atomic mass of the element gallium, given the following information: Isotope Atomic Mass Percent Abundance 69 Ga 68.925580 60.11 71 Ga 70.924700 39.89 2) . Calculate the average atomic mass of lead, given that: Isotope Atomic Mass Percent Abundance 204 Pb 203.973020 206 Pb 205.974440 24.1 207 Pb 206.975872 22.1 208 Pb 207.976627 52.4

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of Zumdahl’s Chemistry . 1B). Dimensional Analysis CONVERSION FACTORS: 1 kg = 2.205 lbs T(°C) = (5 °C/9 °F)*(T(°F) – 32 °F) 1 in = 2.54 cm EXACTLY T(°F) = (9 °F/5 °C)*T(°C) + 32°F 1 fluid oz = 29.574 ml 0 K = - 273.15 °C 1 mol = 6.0221 x 10 23 _____ 1 J = 1 kg m 2 s -2 1 J = 0.2390 cal 3) . Mass You buy 32.5 oz of lunchmeat at the deli counter. How many kilograms is this? 4) . Length A person is 5 ft 7 in tall. How many meters is this? 5) . Volume A car’s gas tank holds 14.5 gallons. How many liters is this? 6) . Density a) . The density of ethanol is 0.789 g/mL. If 17.98 g of ethanol is needed for a solution, what volume in centiliters is needed? b)
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In Class Problems Group 1 - CHEMISTRY 1414 Spring 2011...

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