one mole of P weights about 31 grams
in one mole there are 6.022*10^23 atoms
we use the rule of threes
6.022*10^23atoms......weight..........31 grams
3.45*10^23 atoms.........weight...........x grams
x=(3.45*10^23*31)/6.022*10^23
x=106.95/6.022=<u><em>17.76 grams</em></u>
<span>Which of the following are indicators of a chemical change? Select all that apply.
</span>
These are the answers:
<span>color change
temperature change
precipitate formation
gas formation
Hope this helps.
</span>
Answer:
The rock cycle and plate tectonics cause Earth's rocks to break down over time and they are recycled through natural processes.
Explanation:
Rock cycle(Attachment-1)
<h2>Heptene formed is -</h2><h2>
![CH_3-CH_2-CH_2-CH_2-CH_2-CH=CHBr](https://tex.z-dn.net/?f=CH_3-CH_2-CH_2-CH_2-CH_2-CH%3DCHBr)
</h2>
Explanation:
The two possibilities when the peroxide is not present
+ HBr →![CH_3-CH_2-CH_2-CH_2-CH_2-CBr_2-CH_3](https://tex.z-dn.net/?f=CH_3-CH_2-CH_2-CH_2-CH_2-CBr_2-CH_3)
In presence peroxide,
≡
+ HBr →![CH_3-CH_2-CH_2-CH_2-CH_2-CH=CHBr](https://tex.z-dn.net/?f=CH_3-CH_2-CH_2-CH_2-CH_2-CH%3DCHBr)
- When peroxides are present in the reaction mixture, hydrogen bromide adds to the triple bond of heptane with regioselectivity.
- This reaction is opposite to that of Markovnikov's rule which says that when asymmetrical alkene reacts with a protic acid HX, then the hydrogen of an acid is attached to the carbon with more in number of hydrogen substituents, and the halide (X) group is attached to the carbon with more in number of substituents of alkyl.
- One mole of HBr adds to one mole of 1-heptane.
- The structure of heptene formed is -
![CH_3-CH_2-CH_2-CH_2-CH_2-CH=CHBr](https://tex.z-dn.net/?f=CH_3-CH_2-CH_2-CH_2-CH_2-CH%3DCHBr)