At 50ºC:
50 g NH₄Cl----------------- 100 g (H₂O)
? mass NH₄Cl------------- 200 g (H₂O)
mass NH₄Cl = 200 . 50 / 100
mass
<h3>
Answer:</h3>
Al- [Ne] 3s²3p¹
As- [Ar] 4s²3d¹⁰ 4p³
Explanation:
- Electron configuration of an element shows the arrangement of electrons in the energy levels or orbitals in the atom.
- Noble-gas configuration involves use of noble gases to write the configuration of other elements.
- This is done by identifying the atomic number of the element and then identifying the noble gas that comes before that particular element on the periodic table.
- Aluminium: The atomic number of Al is 13. The noble gas before Aluminium is Neon which has 10 electrons. Therefore the remaining 3 electrons fills up the 3s and 3p sub orbitals.
- Thus, the noble-gas configuration of Al is [Ne] 3s²3p¹
2. Arsenic, Atomic number is 33
- Noble gas before Arsenic is Ar,. Argon has 17 electrons, then the remaining electrons fills up the 4s, 3d and 4p sub-orbitals.
- Thus, the noble-gas configuration of As is [Ar] 4s²3d¹⁰ 4p³
The law of conservation of mass states that mass cannot be created or destroyed. It can only be transformed/transferred from one form to another.
Answer:
The complete equation (a) is:
, and is an exothermica phase change
The complete equation (b) is:
, and is an endothermic phase change.
Explanation:
<em>Equation (a):</em>
, is showing a phase change from a more-energetic state (liquid) to a relative-less-energetic state (solid), that means, that in order to have the phase change, it is requiered to remove heat (energy) from the water, this is known an exothermic (releases heat).
<em>Equation (b).</em>
, shows that to change from a relative-less-energetic phase (liquid) to a more-energetic one (gas), it would be needed to supply energy in order to acomplish this. And it is called endothermic (absorves heat)
ok I got it it is 3
Answer:
hm this is kinda hard lemme think for a second