Answer:
0.193 M
Explanation:
We need to calculate the Zn²⁺ concentration at the cathode where reduction occurs which is the right side in the expression:
Zn2+(aq,0.100 M) ‖ Zn2+(aq,? M) | Zn(s)
Zn²⁺ (aq,?) + 2 e⁻ ⇒ Zn (s)
and oxidation will occur in the anode
Zn (s) ⇒ Zn²⁺ (aq, 0.100 M ) + 2 e⁻
and the overall reaction is
Zn²⁺ (aq,?) ⇒ Zn²⁺ (0.100 M )
The driving force is the difference in concentration and E the electromotive force will be given by
E = Eº - 0.0592/2 log [Zn²⁺ (0.100 M) / Zn²⁺ (M) ]
Plugging the value for E and knowing Eº is cero because we have the same electrodes, we have
17.0 x 10⁻³ = 0 - 0.0592 log 0.100/ X =
- 17.0 x 10⁻³ / 0.0592 = log 0.100 / X
- 0.287 = log (0.100 / X)
Taking inverse log to both sides of the equation
0.516 = 0.100 / X ⇒ X = 0.100 / 0.516 = 0.193 M
Answer:
Heat is the total energy of molecular motion in a substance while temperature is a measure of the average energy of molecular motion in a substance. Heat energy depends on the speed of the particles, the number of particles (the size or mass), and the type of particles in an object. Temperature does not depend on the size or type of object. For example, the temperature of a small cup of water might be the same as the temperature of a large tub of water, but the tub of water has more heat because it has more water and thus more total thermal energy. It is heat that will increase or decrease the temperature. If we add heat, the temperature will become higher. If we remove heat the temperature will become lower. Higher temperatures mean that the molecules are moving, vibrating and rotating with more energy. If we take two objects which have the same temperature and bring them into contact, there will be no overall transfer of energy between them because the average energies of the particles in each object are the same. But if the temperature of one object is higher than that of the other object, there will be a transfer of energy from the hotter to the colder object until both objects reach the same temperature.
Temperature is not energy, but a measure of it. Heat is energy.
Hope I helped :)
Answer:
Mass of Ag produced = 64.6 g
Note: the question is, how many grams of Ag is produced from 19.0 g of Cu and 125 g of AgNO3
Explanation:
Equation of the reaction:
Cu + 2AgNO3 ---> 2Ag + Cu(NO3)2
From the equation above, 1 mole of Cu reacts with 2 moles of AgNO3 to produce 2 moles of Ag and 1 mole of Cu(NO3)2.
Molar mass of the reactants and products are; Cu = 63.5 g/mol, Ag = 108 g/mol, AgNO3 = 170 g/mol, Cu(NO3)2 = 187.5 g/mol
To determine, the limiting reactant;
63.5 g of Cu reacts with 170 * 2 g of AgNO3,
19 g of Cu will react with (340 * 19)/63.5 g of AgNO3 =101.7 g of AgNO3.
Since there are 125 g of AgNO3 available for reaction, it is in excess and Cu is the limiting reactant.
63.5 g of Cu reacts to produce 108 * 2 g of Ag,
19 g of Cu will react to produce (216 * 19)/63.5 g of Ag = 64.6 g of Ag.
Therefore mass of Ag produced = 64.6g
Mg₃N₂ + 6H₂O = 3Mg(OH)₂ + 2NH₃
