1. A 7.45 g sample of calcium carbonate completely decomposes into calcium oxide (lime) and carbon dioxide gas when heated. If 4.17 g calcium oxide is produced, what mass of carbon dioxide must have been formed?  2. A car averages 28.5 miles per gallon of gasoline. How many liters of gasoline will be needed for a trip of 415 km? Some conversion factors that may be helpful are the following: 1qt 0.946 L 1 mile 1.609 km 4 qt 1 gal 1 ft 12 in 3. The number of significant figures in 0.090900 * 10^-4 is 4. The best answer to report for 352.94 - 36.0342 is.  5. Calculate the mass of aluminum that occupies the same volume as 95.7 g of cobalt. The density of cobalt is 8.90 g/cm^3 and the density of aluminum is 2.71 g/cm^3 (ould ease show your work for all problems.)

A glucose solution is frequently used as an intravenous (IV) solution to supply hydration and/or nutrition. Calculate amounts of glucose provided and volumes used. A patient received 2.85 L of a 0.278 M glucose IV solution. What quantity in moles of glucose were administered to the patient?

The noble gas argon was discovered by Sir Walter Ramsay and John William Strutt in England in 1895.  Through this discovery, they made highly accurate measurements of gas densities.  Their experimentally determined densities are:        Oxygen                1.42952 g/L Nitrogen              1.25718 g/L Air                          1.29327 g/L 1) To determine the density of atmospheric nitrogen, Strutt removed the oxygen, water, carbon dioxide, and argon from air and then filled an evacuated glass tube with the remaining gas.   He determined that a mass of 0.20389 g of nitrogen has a density of 1.25718 g/L under standard conditions of temperature and pressure.  What is the volume of the glass tube in cm3?

Large amounts of titanium metal are refined by reacting titanium(III) chloride solution with magnesium metal. To test this refining process, a student reacts 1.55 kg of magnesium metal with excess titanium(III) chloride solution. After the reaction was complete, the student had extracted 1.62 kg of titanium metal. From this data, calculate the percent error of this experiment. Hint: Write a balanced chemical reaction equation and calculate theoretical mass first. Do not show your work in the space provided. Record only your final answer with the correct number of significant digits and the proper units. Answer: Evaluate your calculated percent error. Is this an acceptable percent error?