Homework 3 t Gas Density and Molar Mass 6 of 14 > ReviewI Constants Periodic Table...
Modern pennies are composed of zinc coated with copper. A student determines the mass of a penny to be 2.484 g and then makes several scratches in the copper coating (to expose the underlying zinc). The student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the HCl (the copper remains undissolved): Zn(s)+2HCl(aq)→H2(g)+ZnCl2(aq) The student collects the hydrogen produced over water at 25 ∘C. The collected gas occupies a volume of 0.899 L...
Exercise 5.71 < 9 of 10 > 1 Review Constants Periodic Table Part A The zinc within a copper-plated penny will dissolve in hydrochloric acid if the copper coating is filed down in several spots (so that the hydrochloric acid can get to the zinc). The reaction between the acid and the zinc is 2H+ (aq) + Zn(s) + H2(g) + Zn2+ (aq). When the zinc in a certain penny dissolves, the total volume of gas collected over water at...
please solve for me as always! Thanks you very much. Exercise 5.71 9 of 10 > Review Constants Periodic Table Part A The zinc within a copper-plated penny will dissolve in hydrochloric acid if the copper coating is filed down in several spots (so that the hydrochloric acid can get to the zinc). The reaction between the acid and the zinc is 2H+ (aq) + Zn(s) + H2(g) + Zn²+ (aq). When the zinc in a certain penny dissolves, the...
Page 3 of 3 Gas Density and Molar Mass 9. The density of a diatomic gas is 1.634 g/L at 1.50 atm and 40.0°C. Calculate the molar mass of the gas, and use the periodic table to identify the gas. (10 pts)
ReviewI Constants Periodic Table Part A A gas mixture contains each of the following gases at the indicated partial pressures: N2, 239 torr 02, 157 torr; and He, 141 torr What is the total pressure of the mixture? P. torr Submit Request Answer Part B What mass of each gas is present in a 1.15 L sample of this mixture at 25.0 °C? Enter your answers numerically separated by commas. Submit Request A Provide Feedback Next >
Volume and Moles 6 of 15 > Review Constants Periodic Table Avogadro's law states that the volume, V. of a gas is directly related to the number of moles of the gas when temperature and pressure are constant (Figure 1) Part B Vi Figure A sample of gas in a cylinder as in the example in Part A has an initial volume of 560 L and you have determined that it contains 1.50 moles of gas. The next day you...
chpt.9 pg 11: Pressure and temperature affect the amount of space between gas molecules, which affects the volume and, therefore, the density of the gas since density=massvolume The molar mass of a substance, however, is a constant and can be used to identify an unknown gas sample. Molar mass is found by dividing the mass of a sample (in grams) by the number of moles in that sample. The number of moles of gas can be calculated using the ideal...
9. The density of a diatomic gas is 1.634 g/L at 1.50 atm and 40.0°C. Calculate the molar mass of the gas, and use the periodic table to identify the gas (10 pts)
Experiment 12: Generating Hydrogen Gas Part B: Molar mass of unknown metal Unknown #: Mass of unknown metal (X) .29 Volume of H2 gas L mL Temperature of H; gas 20 mm к C Atmospheric pressure (see barometer) Vapor pressure of water mmHg Partial pressure of H; gas mmHg atm Using PV-nRT and your data, calculate the moles of hydrogen gas produced in the experiment: l e epl8 moles H Convert moles of hydrogen gas to moles of the metal...
Review | Constants Periodic Table Part A A sample of ideal gas at room temperature occupies a volume of 12.0 L at a pressure of 752 torr. If the pressure changes to 3760 torr , with no change in the temperature or moles of gas, what is the new volume, V? Express your answer with the appropriate units. View Available Hint(s) T: MÅ – O ? V2 = Value Units Submit