Answer:
27 amu
Explanation:
The alpha particles is Helium nuclei.
Atomic mass is the sum of the neutrons and protons.
Helium have two protons and two neutrons thus its atomic mass is 4 amu.
₂He⁴
Sodium atom have 12 neutrons and 11 protons. Thus its mass number will be
23 amu.
When it combine with alpha particle it mass will be 27 amu.
23 amu + 4 amu = 27 amu.
Thus new sodium atom have 14 neutrons and 13 protons.
Answer:
498 kj/mol
Explanation:
Chemical reactions occur as a result of bond breaking and bond formation.
The bonds in reactants are broken and atoms are rearranged to form new bonds.
During bond breaking energy is absorbed to break the bonds of reactants while bond formation involves the release of energy during the formation of new bonds.
In our case;
In 1 mole of the Oxygen molecule, there is one O=O bond
Energy absorbed to break O=O is 498 kJ/mol
Therefore, the ΔH required to break all the bonds in one mole of Oxygen(O₂) molecules is 498kJ/mol.
Note that, bond breaking is endothermic since energy is absorbed from the surroundings.
mark brainliest pls
By the number of Electrons in the valence shell if 1=group 1 if 2 its group 2 and so on Valence means outermost shell
Answer:
The total mass of four moles of helium (He) is 16.0104 grams.
Explanation:
