The solutions are the following :
12. C
13. A.
Solution :
It is given that :
The formula of the compound = 
And that 4.70 g of the sample contains 
mol of Br.
It means that :
1 mol of contains = 3 mol of Br
∴ 3 mol of 
contain in 1 mol of
mol of contains 
mol of
Thus the mol of = mol
The given mass is = 4.700 g
Therefore, the 
of 
= 298.4 g/mol
So of = of X + 3 x of Br
298.4 g/mol = of X + 3 x 79.90 g/mol
298.4 g/mol = of X + 239.7 g/mol
of X = 58.71 g/mol (since 1 amu = 1 g/mol)
Therefore the atomic mass of the unknown metal = 58.71 g/mol
So the unknown meta is Nickel.
Answer:
Asteroids are made of rock, metals, and other elements. Some even contain water. Asteroids that are mostly stone sometimes are more likely to lose piles of rubble. Asteroids that are mostly iron are more rock-solid.
Explanation:
Answer:
Nitrile, amide, carboxylic acid, phenyl (aka. arene)
**There are so many functional groups, so I may list some you don't know. There may also be some that I am not aware of. However, these are all the ones I can see.**
Explanation:
Nitrile: (bottom-left) N triple bonded to C
Amide: (middle) N single bonded to 3 carbons
Carboxylic Acid: (bottom-right) C-CO2H
Phenyl: (top-right) six carbon ring with alternating double bonds
