The answer is Cd remember the capital C and lowercase d ! ! 1! ! !! ! ! ! 1 ! ! !
These could all go either way, hardness and other special properties are what I'm guessing would be the most accurate in determining the kind of material.
luster, cleavage, streak, and color can all be affected by other factors. but I guess cleavage would also be accurate. so I guess hardness special properties and cleavage would be the most reliable.
Answer:
The first is Cu2O
Explanation:
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Answer : The molality of sodium chloride is, 1.79 m
Explanation :
To calculate the molality of solution, we use the equation:
![\text{Molality}=\frac{m_{solute}\times 1000}{M_{solute}\times W_{solvent}\text{ (in grams)}}](https://tex.z-dn.net/?f=%5Ctext%7BMolality%7D%3D%5Cfrac%7Bm_%7Bsolute%7D%5Ctimes%201000%7D%7BM_%7Bsolute%7D%5Ctimes%20W_%7Bsolvent%7D%5Ctext%7B%20%28in%20grams%29%7D%7D)
Where,
= Given mass of solute (sodium chloride) = 49 g
= Molar mass of solute (sodium chloride) = 58.5 g/mol
= Mass of solvent (water) = 469 g
Now put all the given values in above equation, we get:
![\text{Molality of }NaCl=\frac{49g\times 1000}{58.5g/mol\times 469kg}\\\\\text{Molality of }NaCl=1.79mol/kg=1.79m](https://tex.z-dn.net/?f=%5Ctext%7BMolality%20of%20%7DNaCl%3D%5Cfrac%7B49g%5Ctimes%201000%7D%7B58.5g%2Fmol%5Ctimes%20469kg%7D%5C%5C%5C%5C%5Ctext%7BMolality%20of%20%7DNaCl%3D1.79mol%2Fkg%3D1.79m)
Hence, the molality of sodium chloride is, 1.79 m