Answer:
1.195 g of Arsenic.
Explanation:
Equation of the reaction:
Ga(l) + As(s) → GaAs(s).
Calculating the limiting reagent by:
Number of moles of:
Gallium:
Molar mass of Gallium = 69.7 g/mol.
Mass = 4 g
Number of moles = mass/molar mass
= 4/69.7
= 0.0574 mol.
Arsenic:
Molar mass of Arsenic = 75 g/mol.
Mass = 5.5 g
Number of moles = mass/molar mass
= 5.5/75
= 0.0733 mol
Therefore, using stoichiometry since 1 mole of Gallium reacted with 1 mole of Arsenic. The limiting reagent is Gallium.
Excess reagent is Arsenic.
Number of moles excess = 0.0733 - 0.0574
= 0.0159 moles
Mass of the excess Arsenic left =
Molar Mass * number of moles
= 0.0159 * 75
= 1.195 g of Arsenic.
Answer:
The answer to your question is :
a) Abundance of Li-6 = 7.49
b) Abundance of Li-7 = 100-7.49 = 92.5
Explanation:
Data Isotopes Mass Abundance
Li-6 6.015 amu y
Li-7 7.016 amu 100 -y
Lithium atomic mass = 6.941
6.941 = (6.015y) + (7.016)(100-y) /100
6.941 = (6.015y + 701.6 - 7.016y) / 100
6.941 x 100 = 6.015y - 7.016y + 701.6
694.1 -701.6 = - 1.001y
-7.5 = -1.001 y
y = 7.49
Abundance of Li-6 = 7.49
Abundance of Li-7 = 100-7.49 = 92.5
Answer:
An ionic bond is formed when a metallic element and a non-metallic element form a compound.
Explanation:
As you may know, each atom contains a set amount of electrons. For example, Hydrogen has one electron, helium has two electrons, lithium has three electrons and so on.
Electrons come in shells. The first shell can hold 2 elections at most, and each shell past this point can hold 8 electrons. When an atom has a filled outer shell, it is considered stable. (This so why the noble gases are unreactive- they have a full outer shell of electrons.)
This is why compounds can form- it is the chemical bonding of 2 or more chemical elements: take NaCl, sodium chloride, or SO2, sulphur dioxide.
You specifically asked about ionic bonds. Ionic bonds, as expressed above, form between a compound of a metallic and non metallic element.
Let's take sodium chloride as an example. Sodium has 1 electron in its outer shell and chlorine has 7. Both need a full outer shell to become stable. Because of this, the sodium atom loses its only electron in its outer shell to become a sodium ion and the chlorine atom gains the electron to become a chlorine ion as well. Because of this, both ions have a full outer shell, rendering them stable.
Now, because the sodium ion is short of one electron, it has more protons than electrons, resulting in it having a positive charge. The chlorine ion is the opposite, having a negative charge.
Answer:
Acceleration Of B IS greater
Explanation:
F= mass x accelerarion
Acceleration of ( A) =20÷5 =4
Acceleration of (B) =5