Is oxygen more reactive than beryllium
2 answers:
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Answer:
Explanation:
<u>1. Energy to heat the liquid water from 55ºC to 100ºC</u>
- m = 10.1g
- C = 4.18g/JºC
- ΔT = 100ºC - 55ºC = 45ºC
<u>2. Energy to change the liquid to steam at 100ºC</u>
- λ = 40.6kJ/mol
- n = 10.1g / 18.015g/mol = 0.5606mol
<u>3. Total energy</u>
Answer:
34,6g of (NH₄)₂SO₄
Explanation:
The boiling-point elevation describes the phenomenon in which the boiling point of a liquid increases with the addition of a compound. The formula is:
ΔT = kb×m
Where ΔT is Tsolution - T solvent; kb is ebullioscopic constant and m is molality of ions in solution.
For the problem:
ΔT = 109,7°C-108,3°C = 1,4°C
kb = 1.07 °C kg/mol
Solving:
m = 1,31 mol/kg
As mass of X = 600g = 0,600kg:
1,31mol/kg×0,600kg = 0,785 moles of ions. As (NH₄)₂SO₄ has three ions:
0,785 moles of ions× = 0,262 moles of (NH₄)₂SO₄
As molar mass of (NH₄)₂SO₄ is 132,14g/mol:
0,262 moles of (NH₄)₂SO₄× = <em>34,6g of (NH₄)₂SO₄</em>
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I hope it helps!