The reaction produces 2.93 g H₂.
M_r: 133.34 2.016
2Al + 6HCl → 2AlCl₃ + 3H₂
<em>Moles of AlCl₃</em> = 129 g AlCl₃ × (1 mol AlCl₃/133.34 g AlCl₃) = 0.9675 mol AlCl₃
<em>Moles of H₂</em> = 0.9675 mol AlCl₃ × (3 mol H₂/2 mol AlCl₃) = 1.451 mol H₂
<em>Mass of H₂</em> = 1.451 mol H₂ × (2.016 g H₂/1 mol H₂) = 2.93 g H₂
Answer:
See answer below
Explanation:
AS we know that the valence for those metals X, Y, and Z are 1, 2 and 3, we can determine the formula of each compound.
1. Hydroxides.
An hydroxide is formed when an oxyde of a metal reacts with water. When this happens, the general molecular formula is:
Meₐ(OH)ₙ
Where:
a: valence or charge of the hydroxide (Which is -1)
n: valence of the metal.
Following this, the formula for X, Y and Z would be:
XOH
Y(OH)₂
Z(OH)₃
2. Sulphates
Sulphates follow a similar rule of hydroxide in the general molecular formula, but instead of having a charge of -1, it has a charge of -2 so:
Mₐ(SO₄)ₙ
So, following the rule:
X₂SO₄
Y₂(SO₄)₂ ------> YSO₄
Z₂(SO₄)₃
3. Hydrogens
Following the same rule as the previous, hydrogens works with a charge of -1, so:
MₐHₙ
Then:
XH
YH₂
ZH₃
4. Carbonates.
This follows the same rule as sulphates, with the same charge so:
Mₐ(CO₃)ₙ
Then:
X₂CO₃
YCO₃
Z₂(CO₃)₃
5. Nitrates
Follow the same rule as the hydroxides, with the same charge of -1.
Mₐ(NO₃)ₙ
Then:
XNO₃
Y(NO₃)₂
Z(NO₃)₂
6. Phosphates
In the case of phosphates, these have a charge of -3 so:
Mₐ(PO₄)ₙ
Then:
X₃PO₄
Y₃(PO₄)₂
Z₃(PO₄)₃ ----> ZPO₄
Hope this helps
Answer:
The mass of an object is 0.6122 Kg
Explanation:
Given:
Acceleration = 9.8 m/s
Force = 58.8 N
To Find:
Mass of an object = ?
Solution:
We know that according to newtons 2nd law
Force is the product of the mass and acceleration
F= ma
where
F = Force
m = mass
a = Acceleration
Substituting the values,
58.8 = m X 9.8
m = 0.6122 kg
Answer:
Therefore we can say that the total number of electrons present in $ p - $ orbital of chlorine atoms is eleven.
Explanation:
Answer:
a) 7.0.
b) Nickel sulfate hepta hydrate.
c) 280.83 g/mol.
d) 44.9%.
Explanation:
<u><em>a) What is the formula of the hydrate?</em></u>
The mass of the hydrated sample (NiSO₄.xH₂O) = 5.0 g,
The mass of the anhydrous salt (NiSO₄) = 2.755 g,
The mass of water = 5.0 g - 2.755 g = 2.245 g.
∴ no. of moles of water = mass/molar mass = (2.245 g)/(18.0 g/mol) = 0.1247 mol.
∴ no. of moles of anhydrous salt (NiSO₄) = mass/molar mass = (2.755 g)/(154.75 g/mol) = 0.0178 mol.
∴ water of crystallization in the sample (x) = no. of moles of water/no. of moles of anhydrous salt (NiSO₄) = (0.1247 mol)/(0.0178 mol) = 7.0.
<u><em>b) What is the full chemical name for the hydrate?</em></u>
The name of the salt (NiSO₄.7H₂O) is Nickel sulfate hepta hydrate.
<u><em>c) What is the molar mass of the hydrate? </em></u>
(NiSO₄.7H₂O)
The molar mass = molar mass of NiSO₄ + 7(molar mass of H₂O) = (154.75 g/mol) + 7(18.0 g/mol) = 280.83 g/mol.
<em><u>d) What is the mass % of water in the hydrate?</u></em>
The mass % of water = (mass of water)/(mass of hydrated sample) x 100 = (2.245 g)/(5.0 g) x 100 = 44.9%.
