The image shows a molecular model of a compound using balls and sticks. Each ball is an atom and each stick is a bond. If you we
re to use balls and sticks to model a molecule of an element, how must your model differ from what’s shown?
A.
The sticks must be shorter.
B.
The balls must be the same color.
C.
The balls must be smaller.
D.
The balls must change to cubes.
A.
The sticks must be shorter.
B.
The balls must be the same color.
C.
The balls must be smaller.
D.
The balls must change to cubes.
2 answers:
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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!