Yes it need to be like that cause when it like that it like that
Answer:
the answer is 0.2
Explanation:
we have a formula that mole= reacting mass/ molar Mass and the molar Mass of KNO3 is 101 so since mole is reacting mass/ molar Mass and our reacting mass is 20.5 then divided it by 101 it is equal to 0.2
Molarity is expressed as moles/L, where L stands for the total volume of the solution. Accordingly, if I have a 1M solution of NaCl, I really have slightly less than 1L of water since the NaCl makes up the remaining solution to give it a FINAL volume of 1L. However, molality is measured in moles per kilogram of the solvent. This implies that I would add 1mol of NaCl to 1kg of water to get a 1 molal solution (the solvent). This occurs to be 1L of water because of the density of water. Due to the addition of some NaCl to my 1kg of water, the final solution volume in this instance is a little bit more than 1L. In terms of temperature, your final volume of 1L of solution would vary if you heated the 1 MOLAR solution from the first paragraph. Due to the expansion caused by heating, it will get bigger. As a result, the molarity varies when the same amount of NaCl is dissolved in more solution. However, the water will expand but not change in mass when the 1 MOLAL solution is heated. There will still be 1 kilogram of water even after expansion. Because of this, regardless of the temperature, the same quantity of NaCl is dissolved in the same mass of solute.
The sand is the residue and a mixture of salt dissolved in water is the filtrate