Answer:
-26.6kJ/mol
Explanation:
The dissolution of NH₄NO₃ is:
NH₄NO₃(aq) → NH₄⁺(aq) + NO₃⁻(aq)
To solve this question we need to find the heat released in the dissolution using the equation of coffee cup calorimeter:
Q = -m*S*ΔT
<em>Where Q is heat,</em>
<em>m is the mass of solution = 1.60g + 75.0g = 76.6g</em>
<em>S is specific heat of the calorimeter (4.18J/g°C)</em>
<em>And ΔT is change in temperature (25°C - 23.34°C = 1.66°C)</em>
<em />
The heat is:
Q = -76.6g*4.18J/g°C*1.66°C
Q = -531.5J = -0.5315kJ are released
The heat released per mole = Enthalpy for the dissolution is:
<em>Moles NH₄NO₃:</em>
1.60g * (1mol / 80.043g) = 0.0200mol
Enthalpy for the dissolution:
-0.5315kJ / 0.0200mol =
<h3>-26.6kJ/mol</h3>
Answer:
0.33 M
Explanation:
From the question given above, the following data were obtained:
Mass of K₂Cr₂O₇ = 9.67 g
Volume of solution = 100 mL
Molarity =?
Next, we shall determine the number of mole in 9.67 g of K₂Cr₂O₇. This can be obtained as follow:
Molar mass of K₂Cr₂O₇ = (39×2) + (52×2) + (16×7)
= 78 + 104 + 112
= 294 g/mol
Mass of K₂Cr₂O₇ = 9.67 g
Mole of K₂Cr₂O₇ =?
Mole = mass /Molar mass
Mole of K₂Cr₂O₇ = 9.67 / 294
Mole of K₂Cr₂O₇ = 0.033 mole
Next, we shall convert 100 mL to litre (L). This can be obtained as follow:
1000 mL = 1 L
100 mL = 100 mL × 1 L / 1000 mL
100 mL = 0.1 L
Finally, we shall determine the molarity of the solution. This can be obtained as follow:
Mole of K₂Cr₂O₇ = 0.033 mole
Volume of solution = 0.1 L
Molarity =?
Molarity = mole / Volume
Molarity = 0.033 / 0.1
Molarity = 0.33 M
Thus, the molarity of the solution is 0.33 M
Answer:
Reeling is the only process not listed.
