In an electrochemical cell, a metal anode lost 0.286 g while a total volume of 0.04854 L of hydrogen gas was produced. The temperature was 298 K and the barometric pressure was 763.5 mm Hg. At 298 K, the vapor pressure of water is 23.8 mm Hg.  What is the molar mass of the metal?

A certain metal M forms a soluble sulfate salt M₂SO4. Suppose the left half cell of a galvanic cell apparatus is filled with a 2.00 M solution of M₂ SO4 and the right half cell with a 10.0 mM solution of the same substance. Electrodes made of M are dipped into both solutions and a voltmeter is connected between them. The temperature of the apparatus is held constant at 25.0 °C. left Which electrode will be positive? x10 right X Ś ? What voltage will the voltmeter show? Assume its positive lead is connected to the positive electrode. 0 Be sure your answer has a unit symbol, if necessary, and round it to 2 significant digits.

A certain metal M forms a soluble nitrate salt M (NO3)₂. Suppose the left half cell of a galvanic cell apparatus is filled with a 5.00 M 2 solution of M (NO3), and the right half cell with a 50.0 mM solution of the same substance. Electrodes made of M are dipped into 2 both solutions and a voltmeter is connected between them. The temperature of the apparatus is held constant at 35.0 °C. Which electrode will be positive? What voltage will the voltmeter show? Assume its positive lead is connected to the positive electrode. Be sure your answer has a unit symbol, if necessary, and round it to 2 significant digits. 0 left right x10 X

Questions 20 and 21 refer to the following information. Galvanic Cell Cell Diagram E°cell (Volts) Mg | Mg2(1.0 M) || Pb*2(1.0 M) | Pb 1 2.24 Zn | Zn(1.0 M) || Pb*2(1.0 M) | Pb 2 0.63 Mg | Mg*(1.0 M) || Zn*2(1.0 M) | Zn 3 The chemical reaction occurring in first galvanic cell is: Mg + Pb*2 → Mg+2 + Pb 21. If the concentration of Mg+2 is changed from 1.0 M to 3.0 M in the galvanic cells above, what will happen to the observed cell voltages in galvanic cells 1 and 3? (A) The voltage in both galvanic cells 1 and 3 will increase. (B) The voltage will decrease in both galvanic cells 1 and 3. (C) The voltage in galvanic cell 1 will increase and will decrease in galvanic cell 3 (D) The voltage in galvanic cell 3 will increase and will decrease in galvanic cell 1. 22. Consider a voltaic cell based on these half-cells. Ag (aq) +e → Ag/s) Cd (aq) + 2e → Cd¢s) E* = +0.80 V E = -0.40 V Identify the anode and give the voltage of this cell under standard conditions. (A) Ag; Ecell = 0.40 V (B) Ag;…

A certain metal M forms a soluble nitrate salt M(NO3)₂. Suppose the left half cell of a galvanic cell apparatus is filled with a 1.00 M solution of M 2 M(NO3), and the right half cell with a 0.500 mM solution of the same substance. Electrodes made of M are dipped into both solutions and a voltmeter is connected between them. The temperature of the apparatus is held constant at 40.0 °C. Which electrode will be positive? O left O right What voltage will the voltmeter show? Assume its positive lead is connected to the positive electrode, 0 Be sure your answer has a unit symbol, if necessary, and round it to 2 significant digits. 0 X

In an electrochemical cell, a metal anode lost 0.259 g while a total volume of 0.08398 L of hydrogen gas was produced. The temperature was 298 K and the barometric pressure was 747.5 mm Hg. At 298 K, the vapor pressure of water is 23.8 mm Hg.  How many moles of hydrogen gas were collected?

2 A certain metal M forms a soluble nitrate salt M(NO3)₂. Suppose the left half cell of a galvanic cell apparatus is filled with a 1.00 M solution of M(NO3), and the right half cell with a 100. mM solution of the same substance. Electrodes made of M are dipped into both solutions and a voltmeter is connected between them. The temperature of the apparatus is held constant at 35.0 °C. left x10 Which electrode will be positive? right X ? What voltage will the voltmeter show? Assume its positive lead is connected to the positive electrode. 0 Be sure your answer has a unit symbol, if necessary, and round it to 2 significant digits.

A certain metal M forms a soluble nitrate salt M(NO3). Suppose the left half cell of a galvanic cell apparatus is filled with a 4.00 M solution of M(NO3), and the right half cell with a 200. mM solution of the same substance. Electrodes made of M are dipped into both solutions and a voltmeter is connected between them. The temperature of the apparatus is held constant at 30.0 °C. Which electrode will be positive? What voltage will the voltmeter show? Assume its positive lead is connected to the positive electrode. Be sure your answer has a unit symbol, if necessary, and round it to 2 significant digits. left ☐ x10 right

A certain metal M forms a soluble sulfate salt M, SO4. Suppose the left half cell of a galvanic cell apparatus is filled with a 250. mM solution of M,SO, and the right half cell with a 2.50 M solution of the same substance. Electrodes made of M are dipped into both solutions and a voltmeter is connected between them. The temperature of the apparatus is held constant at 35.0 °C. left Which electrode will be positive? Ox10 right ? What voltage will the voltmeter show? Assume its positive lead is connected to the positive electrode. Be sure your answer has a unit symbol, if necessary, and round it to 2 significant digits.

Consider the following galvanic cell:     E° (V) U3+  +  3 e−   →   U(s) −1.642 In3+  +  2e−   →   In+ −0.444 What is the cathode? U/U3+ In3+/In+ Pt/In3+ Pt/In+