What type of change occurs as salt dissolves in water?
1 answer:
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Answer:
Explanation:
To find the weight (W) of the pond contents first we need to use the following equation:
(1)
Where m the mass and g is the gravity
Also, we have that the mass is:
(2)
Where ρ is the density and V the volume
We cand calculate the volume as follows:
(3)
Where L is the length, w is the wide and d is the depth
By entering equation (2) and (3) into (1) we have:
Therefore, the weight of the pond is 6.65x10⁶ lbf.
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Answer:
-1140 kJ/mol.
Explanation:
Let's consider the following balanced equation:
N₂O₄(l) + 2 N₂H₄(l) ⇒ 3 N₂(g) + 4 H₂O(g)
When 10.0 g of N₂O₄ react 124 kJ of heat are released. By convention, when heat is released we use the negative sign. Since the molar mass of N₂O₄ is 92.0 g/mol, the enthalpy of reaction is: