1. I have a concentration of 300g of sugar for every 100 mL of water. What is the lowest possible temperature I would need to di
ssolve that much sugar? ____________.
1 answer:
Answer:
64 °C
Explanation:
I’m guessing that “they” are asking you to interpret a solubility curve something like the one below.
Find the point at 300 g/100 mL water on the vertical axis.
From there, draw a horizontal line until it meets the solubility curve of sugar.
Then, drop a vertical line to the temperature axis.
It appears to hit the axis at about <em>64 °C</em>.
The solution is saturated at this temperature, so 64 °C is the lowest temperature at which you can dissolve 300 g of sugar in 100 mL of water.
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1) 385 J
2) 450 J
Explanation:
1)
The amount of energy that must be absorbed by a certain substance in order to increase its temperature by is given by the equation:
where
m is the mass of the substance
C is its specific heat capacity
is the increase in temperature of the substance
For the block of copper in this problem, we have:
m = 10 g is the mass
is the specific heat capacity of copper
is the change in temperature
So, the energy absorbed by the block of copper is
2)
Similarly for the block of iron, the energy absorbed by the iron is given by
where
m is the mass of the block of iron
C is its specific heat capacity of iron
is the increase in temperature of the block
Here we have:
m = 10 g is the mass of the block
is the specific heat capacity of iron
is the change in temperature
So, the energy absorbed by the block of iron is