Answer:
International system. The SI unit for specific heat is joule per kelvin per kilogram (J/K/kg, J/(kg K), J K−1 kg−1, etc.). Since an increment of temperature of one degree Celsius is the same as an increment of one kelvin, that is the same as joule per degree Celsius per kilogram (J/°C/kg).
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The highest solubility of a solute will be when it has the greatest quantity in g when dissolved in 100 g of water. So the solute that is most soluble in water, will have a higher g/100 g water.
1:
a: 0°C - Sucrose will be the solute that is most soluble in water.
b: 80 °C - Also Sucrose will be the most soluble in water.
2:
Yes, as we can see in the graph, sucrose, potassium nitrate, ammonium sulfate and sodium chloride have different solubilities between them and at different temperatures. For example, solubility at 0 °C:
sucrose: 180 g / 100 g of water
potassium nitrate: ~10 g/ 100 g of water
ammonium sulfate: 80 g/100 g water
sodium chloride: 30 g/ 100 g of water
0.2625 litres is the volume of methanol should be used to make 1.25 L of a 21.0% by volume solution.
Explanation:
Given that:
Volume of solution = 1.25 litres
methanol to be present in the composition of 21% of the volume.
To make 21 % solution by volume of a substance it means that 21 L of the substance is present in 100 L of the solution which is made upto 100 L by adding the solvent.
So, 21 L in 100 L will make 21% solution
x litres of methanol in 1.25 L of solution
So, 
= 
x = 0.2625 litres
hence, 0.2625 litres of the methanol will be added and the volume will be made to 1.25 litres so that 21% solution by volume gets form.
Answer:
8 gram
Explanation:
in case of NaOH, normality=molarity
so normality=molarity×acidity or basicity(in case of NaOH it's 1)
then
weight of NaOH required = volume in ml × equivalent weight × normality / 1000
so
1000× 40× 0.2/1000
=8 gram
Answer: 60.117 g
Explanation: 
multiply and quit all "mol" and you get the grams
