Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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- A sample of unknown metal (X) of mass 0.116-g reacts with hydrochloric acid to produce 77.5mL of “wet” gas at 20 °C and 754 mmHg. What is the unknown metal (X), (The vapor pressure of water at 20 °C is 18 mmHg). 2X(s) +6HCl (aq) -->2XCl2 + 3H2(g) A) Ni B) Cr C) Mn D) Fe E) Gaarrow_forwardWhat is the percent yield when 0.0506 mole of H2O2 decomposes and experimentally produces 375 mL of O2 gas measured at 42 degrees Celsius and 1.52 atm 2H2O2(aq) --> 2H2O(l) + O2(g)arrow_forward(a) (c) A column of water in a buret is 336 mm Hg high. How high would that column be if it were mercury instead of water? (d) In order for the pressures to be equal, density and height of a column are inversely proportional, therefore the following relationship applies: (denHg)(hHg) = (denH20)(hH20) Note: the density of mercury is 13.6 g/mL and the density of water is 1.00 g/mL. An electrolysis experiment was run for 15 minutes and 45 seconds at an average current of 189 milliamps (mA). The mass lost by the copper anode was 0.0589 grams. (b) Calculate the number of coulombs transferred. (Remember: coulomb = amps x sec) Show full calculation of the height in mercury (remember to use proper significant figures.) Calculate the moles of copper lost from the anode. Based on the moles of copper lost determined in 1c, calculate the moles of electrons transferred. Remember, the reaction at the copper anode is: Cu(s)---> Cu¹² (aq) + 2 earrow_forward
- The average kinetic energy of the molecules in a gas sample depends only on the temperature, T. However, given the same kinetic energies, a lighter molecule will move faster than a heavier molecule, as shown in the equation for rms speed 3 RT rms speed where R = 8.314 J/ (mol-K) and M is molar mass in kilograms per mole. Note that a joule is the same as a kilogram-meter squared per second squared (kg-m?Is?). What is the rms speed of F, molecules at 303 K? 2 rms speed: m/s What is the rms speed of He atoms at 303 K? rms speed: m/sarrow_forwardThe average kinetic energy of the molecules in a gas sample depends only on the temperature, T. However, given the same kinetic energies, a lighter molecule will move faster than a heavier molecule, as shown in the equation for rms speed 3 RT rms speed where R = 8.314 J/ (mol·K) and M is molar mass in kilograms per mole. Note that a joule is the same as a kilogram-meter squared per second squared (kg-mIs²). What is the rms speed of O, molecules at 307 K? rms speed: m/s What is the rms speed of He atoms at 307 K? rms speed: m/sarrow_forwardAt 287 K and 1.43*10^-2 atm, the density of a gas is 1.37*10^-5 g/cm^3. (a) Find the Vrms for the gas molecules. (b) Find the molar mass of the gas.arrow_forward
- An “empty" spray can contains residual propellant gas that has a pressure of 772 torr at 23°C. The can is then heated to 475 °C. (a) What is the gas pressure in the hot can if the volume remains constant? (b) What is the gas pressure in the hot can if the can slightly expands during heating and its volume increases by 6.50%?arrow_forward(a) Place the following gases in order of increasing average molecular speed at 25°C: CO, SF, H,S, Cl, HI. (Type your answer using the format SF6 for SFg.) slowest fastest (b) Calculate the ms speed of CO at 70.0°C. m/sarrow_forwardA gaseous “CFC” compound has a density of 5.456 g/L at 0.993 atmand 22.0oC. (a) Calculate the molar mass of the compound. (b) If the compound has the following composition: 18.10% C; 28.60% F, and 53.30% Cl, by mass, determine the molecular formula of the compound. (CFC = chlorofluorocarbon)arrow_forward
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