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2 answers:
Answer: Option (a) is the correct answer.
Explanation:
Specific heat is defined as the heat energy necessary to raise the temperature of a 1 kg of substance by one degree celsius.
For example, specific heat of water is 4.18 J
Whereas heat of vaporization is the energy absorbed at a certain temperature to convert a unit mass of a substance from liquid to vapor state.
Hence, we can conclude that Sascha is observing the property that water has a high specific heat capacity.
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Answer:
42,5 mL
Explanation:
We need to use the serial dilution formula beacuse we start with a stock concentrate solution and we need to prepare a new less concentrated one.
<u>DF in the dilution factor, Vi is the initial volume and Vf is the final volume.</u>
The first step is to have the same measurment unit so we need to convert 345 µg to mg.
we know that 1 µg equals 0,001 g, hence:
now the final volume is 0,345 mg protein/ mL and the inital volume is 15mg protein/mL, both of them are in the same unit so we can use the formula
Now since the question said that we already have 1.0mL of the amylase stock solution we need to subtract that 1.0mL to the 43,5 mg protein/mL
So, we need 42,5 mL of diluting buffer if we want a final concentration of 345 µg protein/mL (0.345 mg protein/mL)