Answer:
A:Boyle's Law or B:Charles's Law
Explanation:
Answer : The mass of sodium bromide added should be, 18.3 grams.
Explanation :
Molality : It is defined as the number of moles of solute present in kilograms of solvent.
Formula used :
![Molality=\frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Mass of solvent}}](https://tex.z-dn.net/?f=Molality%3D%5Cfrac%7B%5Ctext%7BMass%20of%20solute%7D%5Ctimes%201000%7D%7B%5Ctext%7BMolar%20mass%20of%20solute%7D%5Ctimes%20%5Ctext%7BMass%20of%20solvent%7D%7D)
Solute is, NaBr and solvent is, water.
Given:
Molality of NaBr = 0.565 mol/kg
Molar mass of NaBr = 103 g/mole
Mass of water = 315 g
Now put all the given values in the above formula, we get:
![0.565mol/kg=\frac{\text{Mass of NaBr}\times 1000}{103g/mole\times 315g}](https://tex.z-dn.net/?f=0.565mol%2Fkg%3D%5Cfrac%7B%5Ctext%7BMass%20of%20NaBr%7D%5Ctimes%201000%7D%7B103g%2Fmole%5Ctimes%20315g%7D)
![\text{Mass of NaBr}=18.3g](https://tex.z-dn.net/?f=%5Ctext%7BMass%20of%20NaBr%7D%3D18.3g)
Thus, the mass of sodium bromide added should be, 18.3 grams.
All of these are compounds except oxygen because a compound is two or more different elements bonded together.
Answer:
Matter is anything that has mass and takes up space. Matter can change form through physical and chemical changes, but through any of these changes, matter is conserved. The same amount of matter exists before and after the change none is created or destroyed.
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