Answer:
Explanation:
Hello,
In this case, we can compute the change in the solution enthalpy by using the following formula:
Whereas the mass of the solution is 350 g, the specific heat capacity is 4.184 J/g °C and the change in the temperature is 1.34 °C, therefore, we obtain:
It is important to notice that the mass is just 350 g that is the reacting amount and by means of the law of the conservation of mass, the total mass will remain constant, for that reason we compute the change in the enthalpy as shown above, which is positive due to the temperature raise.
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Complete Question
To make use of an ionic hydrate for storing solar energy, you place 422.0 kg of sodium sulfate decahydrate on your house roof. Assuming complete reaction and 100% efficiency of heat transfer, how much heat (in kJ) is released to your house at night? Note that sodium sulfate decahydrate will transfer 354 kJ/mol.
Answer:
The amount of energy released is
Explanation:
Number of moles is mathematically represented as
substituting for mass of sodium sulfate decahydrate(), (This value is a constant )for the molar mass of sodium sulfate decahydrate
From the question we are told that
1 mole of sodium sulfate decahydrate generates of energy
So 1309.7 mole would generate x
Now stating the relation mathematically
1 mol → 354KJ
1309.7 mol → x
=>
Answer:
<h2>11.2 g</h2>
Explanation:
Given,
Mass of P = 4.89 g
Molar mass of = 30.9738 g/mol
The formula for the calculation of moles is shown below:
Thus,
According to the reaction shown below as:-
4 moles of P on reaction forms 2 moles of diphosphorus pentoxide
Also,
1 mole of P on reaction forms 2/4 mole of diphosphorus pentoxide
0.158 moles of P on reaction forms moles of diphosphorus pentoxide
Moles of diphosphorus pentoxide = 0.079 moles
Molar mass of diphosphorus pentoxide = 141.9445 g/mol
<u>Mass = Moles * Molar mass = 0.079 moles * 141.9445 g/mol = 11.2 g</u>
The <u>actual yield of iron (Fe)</u> in moles is <u>0.207 mol.</u>
Why?
Since we know the <u>chemical equation</u>, and how much Fe is produced, we can calculate the actual yield of iron in moles using the following equation:
From the statement, we know that there are <u>11.6 g of Fe.</u>
We also know the molar mass of the Fe which is:
Now, calculating we have:
Hence, we have that the<u> </u><u>actual yield of iron (Fe)</u> in moles is<u> </u><u>0.207 mol.</u>
Have a nice day!
Answer is: ph value of pyridine solution is 9.1.
Chemical
reaction: C₅H₅N +
H₂O → C₅H₅NH⁺ + OH⁻.<span>
c(pyridine - C</span>₅H₅N)
= 0.115M.<span>
Kb(C</span>₅H₅N)
= 1.4·10⁻⁹.
[C₅H₅NH⁺] = [OH⁻] = x; equilibrium concentration.<span>
[</span>C₅H₅N] =
0.115 M - x.
Kb = [C₅H₅NH⁺] · [OH⁻] / [C₅H₅N].
1.4·10⁻⁹ = x² / (0.115 M -x)
Solve quadratic equation: x = [OH⁻] = 0.0000127 M.<span>
pOH = -log(0.0000127 M) = 4.9</span>
<span>pH = 14 - 4.9 = 9.1.</span>