The balanced equation for the above reaction is
2Al + 6H₂O ---> 2Al(OH)₃ + 3H₂
stoichiometry of Al to H₂ is 2:3
number of Al moles reacted - 78.33 g / 27 g/mol = 2.901 mol
according to molar ratio
2 mol of Al forms - 3 mol of H₂
therefore 2.901 mol of Al - forms 3/2 x 2.901 = 4.352 mol
molar volume states that 1 mol of any gas occupies a volume of 22.4 L at STP
if 1 mol occupies 22.4 L
then 4.352 mol occupies - 22.4 L/mol x 4.352 mol = 97.48 L
volume occupied by H₂ is 97.48 L
Photosynethesis, respiration, and combustion.
Answer:
C. Fe will stay positive and increase in magnitude.
Explanation:
Coulomb's law states that the force of attraction of repulsion between two charged particles is directly proportional to the magnitude of their charges and inversely proportional to the square of the distance of separation between them.
This means that if the size of the charges are large, the force acting on them will be large as well. Also if the distance between the two charges increases the force decreases. However, the force increases when the distance of separation decreases.
Like charges repel, therefore, two negative charges brought together will repel each other, and the distance between the two charges decreases, the force will increase in magnitude. Forces of repulsion are considered positive, therefore, the force, Fe, will stay positive and increase in magnitude.
Warm is less heaver then cold air so warm air rise and cold air sinks
Answer:
The least amount of energy emitted in this case is 0.6 eV.
The corresponding quantum number n would be n=4.
The wavelenght asociated to the emitted photon would be 2.06 m, corresponding to the Infrared spectrum.
Explanation:
For calculating the energy of an electron emitted/absorbed in an electronic transition of the hydrogen atom, the next equation from the Bohr model can be used:
, where E is the photon energy, is the energy of the first energy level (-13.6 eV), Z is the atomic number, is the quantum number n of the starting level and the quantum number n of the finishing level. In this case, , and , because this excited level is the next in energy to n=3.
Considering that , and using the Planck equation , you can calculate the wavelenght or the frequency associated to that photon. Values in the order of m in wavelenght belong to the Infrared spectrum, wich can not being seen by humans.