Description It is the second leading cause of lung cancer in the U.S. It cannot be seen, smelled, or tasted. It is a product of the natural decay of uranium and is often found in the soil on which houses are built. All of these
Description detect thyroid problems in people date fossils from organisms that once lived a very long time ago measure the amount of radiation in an area treat cancer in patients
Description N2(g) + O2(g)2NO(g) H° = 181 kJ and S° = 24.9 J/K G° would be negative at temperatures (above, below) K. Enter above or below in the first box and enter the temperature in the second box. Assume that H° and S° are constant.
Description 1. An unknown compound is found to consist of 24.3% carbon 4.1% hydrogen and 71.6% chlorine. If the molar mass is 98.8g/mol what is the molecular formula of the compound?
Description 1. A prevailing pressure of one standard atmosphere will support a column of mercury 760 mm in height. Liquid carbon tetrachloride has a density of 1.59 g/mL. The height of a column of carbon tetrachloride that one standard atmosphere can support is ______ mm. The density of liquid mercury is 13.6 g/mL. 2. Liquid methylene chloride has a density of 1.33 g/mL. A barometer is constructed using methylene chloride instead of mercury. If the atmospheric pressure is 0.952 atm, what is the height of the methylene chloride column in the barometer in cm? The density of liquid mercury is 13.6 g/mL. 3. A sample of oxygen gas occupies a volume of 9.58 L at 46 °C and 0.638 atm. If it is desired to increase the volume of the gas sample to 12.1 L, while decreasing its pressure to 0.413 atm, the temperature of the gas sample at the new volume and pressure must be _____ °C. 4. A sample of gas contains 0.1400 mol of H2(g) and 7.000E-2 mol of O2(g) and occupies a volume of 7.05 L. The following reaction takes place: 2H2(g) + O2(g)--->2H2O(g) Calculate the volume of the sample after the reaction takes place, assuming that the temperature and the pressure remain constant. 5. A sample of gas contains 0.1100 mol of CH4(g) and 0.2200 mol of O2(g) and occupies a volume of 11.9 L. The following reaction takes place: CH4(g) + 2O2(g)--->CO2(g) + 2H2O(g) Calculate the volume of the sample after the reaction takes place, assuming that the temperature and the pressure remain constant. 6. A sample of oxygen gas collected at a pressure of 0.851 atm and a temperature of 29.0 °C is found to occupy a volume of 28.1 liters. How many moles of O2 gas are in the sample? _____ mol 7. A sample of helium gas collected at a pressure of 0.578 atm and a temperature of 297 K is found to occupy a volume of 530. milliliters. How many moles of He gas are in the sample? 8. A sample of helium gas collected at a pressure of 797 mm Hg and a temperature of 277 K has a mass of 2.31 grams. The volume of the sample is _____ L. 9. According to the ideal gas law, a 0.9150 mol sample of nitrogen gas in a 1.753 L container at 265.8 K should exert a pressure of 11.38 atm. By what percent does the pressure calculated using the van der Waals' equation differ from the ideal pressure? For N2 gas, a = 1.390 L2atm/mol2 and b = 3.910E-2 L/mol. Hint: % difference = 100 x (P ideal - Pvan der Waals) / P ideal 10. What volume of hydrogen sulfide is required to produce 29.6 liters of sulfur dioxide according to the following reaction? (All gases are at the same temperature and pressure.) hydrogen sulfide (g) + oxygen(g)--->water (l) + sulfur dioxide(g) _____ L Hydrogen Sulfide
Description When 157.0 grams of CaSO4 are dissolved in enough water to yield a volume of 7.25x102 milliliters of solution. The molarity of this solution will be... (a) 0.0016 M (b) 0.837 M (c) 1.15 M (d) 1.59 M
