There is water on the pan of the scale as you measure the mass of an object. If you were to ignore the water, what would be the
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Answer: The change in enthalpy for each mole of zinc involved in the reaction is 152.4 kJ/mol.
Explanation:
First, we need to determine the moles of Zn and HCl.
The molar mass of Zn is 65 g/mole
and,
Next, we must identify the limiting reagent and the excess reagent.
The chemical reaction given is:
According to the balanced reaction we find that
1 mole of reacts with 2 moles of
Thus, 0.0206 moles of react with
moles of
This leads us to determine that is the excess reagent because the moles provided exceed the required moles, while
is limiting and restricts product formation.
Now to find the enthalpy change for each mole of zinc reacting in this reaction.
From the reaction we gather that,[ [TAG_59]]
0.0206 moles of Zn yield heat = 3.14 kJ
This implies that 1 mole of Zn generates heat =
Hence, the enthalpy change per mole of zinc involved in this reaction amounts to 152.4 kJ/mol.
Answer:
The specific heat value for silver is 0.236 J/g-C.
Explanation:
Silver has a mass of 25 grams.
The temperature shifts from 31.5° C to 58.7° C.
The required heat is equivalent to 25 g.
To determine silver's specific heat, the following equation applies:
Where c represents the specific heat of silver.
Thus, the specific heat of silver is 0.236 J/g-C.