Chlorine is widely used to purify municipal water supplies and to treat swimming pool water. Suppose that the volume of a partic
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Answer:
The answer to your question is given after the questions so I just explain how to get it.
Explanation:
a)
Get the molecular weight of Phosphoric acid
H₃PO₄ = (3 x 1) + (31 x 1) + (16 x 4)
= 3 + 31 + 64
= 98 g
98 g ----------------- 1 mol
0.045 g --------------- x
x = (0.045 x 1) / 98
x = 0.045 / 98
x = 0.00046 moles or 4.6 x 10 ⁻⁴
b)
Molarity =
Molarity =
Molarity = 0.0013 or 1.31 x 10⁻³
c)
Formula C₁V₁ = C₂V₂
V₁ = C₂V₂ / C₁
Substitution
V₁ = (0.0013)(1) / 0.01
Simplification and result
V₁ = 0.0013 / 0.1
V₁ = 0.13 l = 130 ml
Answer : The value of for the reaction is, -565 kJ/mol
Explanation :
The formation of sodium bromide is,
= enthalpy of the reaction
The steps involved in the reaction are:
(1) Conversion of gaseous sodium atoms into gaseous sodium ions.
= ionization energy of sodium = 496 kJ/mol
(2) Conversion of gaseous bromine atoms into gaseous bromine ions.
= electron affinity energy of bromine = -325 kJ/mol
(3) Conversion of gaseous cations and gaseous anion into solid sodium bromide.
= lattice energy of sodium bromide = -736 kJ/mol
To calculate the for the reaction, the equation used will be:
Now put all the given values in this equation, we get:
Therefore, the value of for the reaction is, -565 kJ/mol
Moles of gas = 0.369
<h3>Further explanation</h3>Given
P = 2 atm
V = 5.3 L
T = 350 L
Required
moles of gas
Solution
Ideal gas Law
Avogadro's law : at the same temperature and pressure, the ratio of gas volume will be equal to the ratio of gas moles
moles of O₂ = 45% x 0.369 = 0.166
moles of Ar = 12% x 0.369 = 0.044
moles of N = 43% x 0.369 = 0.159