How is counting a truckload of pennies like counting the atoms in 10.0 g of aluminum? How is it different?
1 answer:
Answer:
Explanation:
A truckload of pennies is quite a very large amount of problem to solve. A truck can carry a lot of coins which can be up to several millions in number approximately.
This is similar to counting the number of atoms in 10.0g of aluminium.
In a mole of any substance, there are 6.02 x 10²³ atoms.
number of moles =
molar mass of Al = 27g/mole
number of moles = = 0.37moles
Number of atoms = 0.37 x 6.02 x 10²³ = 2.23 x 10²³ atoms
In 10g of aluminium, there are 2.23 x 10²³ atoms. It is even much more tedious to count.
Difference;
We can see the pennies in the truckload. They are discrete. It is impossible to see atoms in a substance this way.
Also, the number of atoms in 10g of aluminium is more than that of pennies in a truckload.
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Answer: The total energy, in kilojoules, that is needed to turn a 46 g block of ice at -25 degrees C into water vapor at 100 degrees C is 11.787 kJ.
Explanation:
Given: Mass = 46 g
Initial temperature =
Final temperature =
Specific heat capacity of ice = 2.05
Formula used to calculate the energy is as follows.
where,
q = heat energy
m = mass
C = specific heat capacity
= initial temperature
= final temperature
Substitute the values into above formula as follows.
Thus, we can conclude that the total energy, in kilojoules, that is needed to turn a 46 g block of ice at -25 degrees C into water vapor at 100 degrees C is 11.787 kJ.