1. A) Determine the molecular mass of iron (III) bromide hex hydrate, a substance used as a catalyst in organic reactions. B) Iodine pent fluoride reacts slowly with glass and violently with water. Determine its molecular mass. Propane, C3H8, is commonly provided as a bottled gas for use as a fuel. In 0.200 mol of propane a. what is the mass of propane? b. what mass of carbon is present? c. how many molecules of C3Hg are present? d. how many hydrogen atoms are present? 3. A compound consisting of C, H, and O only, has a molar mass of 331.5 g/mol. Combustion of 0.1000 g of this compound caused
1. A) Determine the molecular mass of iron (III) bromide hex hydrate, a substance used as a catalyst in organic reactions. B) Iodine pent fluoride reacts slowly with glass and violently with water. Determine its molecular mass. Propane, C3H8, is commonly provided as a bottled gas for use as a fuel. In 0.200 mol of propane a. what is the mass of propane? b. what mass of carbon is present? c. how many molecules of C3Hg are present? d. how many hydrogen atoms are present? 3. A compound consisting of C, H, and O only, has a molar mass of 331.5 g/mol. Combustion of 0.1000 g of this compound caused a 0.2921 g increase in the mass of the CO2 absorber and a 0.0951 g increase in the mass of the H2O absorber. What is the empirical formula of the compound? 4. Balance the following equation for partial oxidation of ammonia, an important reaction in the production of nitric acid: NH3(g) + O2(g) NO(g) + H20(1) Consider the balanced equation for the combustion of propane, C3H8 C3H2(g) + 502 (g) ? 3C02(g) + 4H2O(1) If propane reacts with oxygen as above a. what is the limiting reagent in a mixture containing 5.00 g of C3H8 and 10.0 g of Oz? b. what mass of CO2 is formed when 1.00 g of CzHg reacts completely? 5. The insecticide DDT was formerly in widespread use, but now it is severely restricted owing to its adverse environmental effects. It is prepared as follows: C2HC130 + 2C.HSCI-C14H.Cis + H2O chloral chlorobenzene DDT If 10.00 g of chloral were reacted with 10.00 g of chlorobenzene a. what is the maximum amount (mol) of DDT which could be formed? b. what is the limiting reagent? c. what is the % yield, if 12.15 g of DDT is produced? 6. A) If the density of a certain spherical atomic nucleus is 1.0 x 10″g cm x 10 g, what is its radius in cm? and its mass is 2.0 B) What is the density (g/mL) of the irregular solid of weight 66.2 grams, if the initial volume of water in a graduated cylinder was 56.7 cm and the volume of the water and solid together was 73.2 cm? C) A silver sphere has a mass of 5.492 g and a diameter of 10.0 mm. What is the density of silver metal in grams per cubic centimeter (g/cm)? 7. A) A 0.00100 mol sample of Ca(OH)2 requires 25.00 mL of aqueous HCl for neutralization according to the reaction below. What is the concentration of the HCI? Equation: Ca(OH)2(s) + 2HCl(aq) – CaCl2(aq) + H2O(1) B) How many milliliters of 1.58 M HCl are needed to react completely with 23.2 g of NaHCO3 ? 8. Calculate to three significant figures) the numerical part of the conversion factors needed to carry out the following unit conversions: a. a. density in 1.00 g/cm to kg/m b. d. area in 1.00 km to cm? c. e. mass/area of aluminum foil in 1.00 mg/cm to g/m 9. Calculate to three significant figures) the numerical part of the conversion factors needed to carry out the following unit conversions: a. density in 1.00 g/cm to kg/m b. area in 1.00 kmto cm? c. mass/area of aluminum foil in 1.00 mg/cm to g/m2 10. A student heats 100 mL of water to 76 C. The temperature of the surrounding environment was a constant 26 C. The water-cooled to 34 C after a time interval of 25 minutes. Find the time required for the water to cool from 34 C to 24 C. Hint: Lab Experiment #2
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